OSP Engineer Mountain Ltd.OSP EngineerBoise, IDPerforms duties such as collecting field data, preparing/organizing permit packages for submittal to the appropriate entities, maintaining complex files, keeping records, searching, and investigating information contained in files, processing departmental documents requiring specific knowledge of functional operations, posting records including accounting and continuing property records, typing correspondence and reports from rough drafts, and assisting engineers as requested. The OSP Design Engineer performs detailed outside plant facility engineering tasks that includes estimating, analyzing, designing, planning, budget tracking estimates against actual costs for copper and fiber cables, poles, direct buried and conduit systems.
NewLead EPC Substation Project Engineer LeidosLead EPC Substation Project EngineerBoise, ID$107,900–$195,050These consulting services provide clients with overall project management tasks in the areas of comprehensive engineering design of electrical transmission and distribution, substation and transmission line projects nationwide. March 31, 2026 For U.S. Positions: While subject to change based on business needs, Leidos reasonably anticipates that this job requisition will remain open for at least 3 days with an anticipated close date of no earlier than 3 days after the original posting date as listed above.
NewShift Equipment Engineer ID1 Micron Technology IncShift Equipment Engineer ID1Boise, IDThey are also required to assist with equipment installations, engineering tests, build and modify equipment procedures, increase tool uptime through systematic problem solving and quality workmanship, and thoroughly document all maintenance. Partners with Equipment Owners and Shift Engineers/Technicians to implement daily activities to resolve issues that could cause yield loss, excursions, defects, tool restrictions, or output loss.
Senior Photolithography Equipment Engineer Micron Technology IncSenior Photolithography Equipment EngineerBoise, IDAs a Senior Photolithography Equipment Engineer , with a strong focus on safety and quality, you will play a meaningful role in improving our manufacturing processes by focusing on the installation, maintenance, optimization, and development of our Photolithography equipment. With plans to invest more than $150 billion globally over the next decade in leading-edge manufacturing, we are looking for passionate people to join our Boise expansion team and contribute to the growth and innovation of the semiconductor industry.
Senior Wet Etch Equipment Engineer Micron Technology IncSenior Wet Etch Equipment EngineerBoise, IDAs a Senior Wet Etch Equipment Engineer , with a strong focus on safety and quality, you will play a meaningful role in improving our manufacturing processes by focusing on the installation, maintenance, optimization, and development of our wet etching equipment. With plans to invest more than $150 billion globally over the next decade in groundbreaking manufacturing, we are looking for hard-working people to join our Boise expansion team and give to the growth and innovation of the semiconductor industry.
Reticle Equipment Engineer Micron Technology IncReticle Equipment EngineerBoise, IDThis position requires close collaboration with Photo process teams, Manufacturing, AMHS/Automation, IT, and Global Quality to drive continuous improvement and manufacturing excellence, including the use of advanced data analytics and AI-driven solutions. The Photolithography (Photo) organization supports high-volume semiconductor manufacturing at Micron’s Boise facility, enabling advanced memory solutions through detailed reticle and lithography processes.
Senior Dry Etch Equipment Engineer Micron Technology IncSenior Dry Etch Equipment EngineerBoise, IDAs a Senior Dry Etch Equipment Engineer , with a strong focus on safety and quality, you will play a meaningful role in improving our manufacturing processes by focusing on the installation, maintenance, optimization, and development of our Dry Etch equipment. With plans to invest more than $150 billion globally over the next decade in leading-edge manufacturing, we are looking for passionate people to join our Boise expansion team and contribute to the growth and innovation of the semiconductor industry.
Senior PCVD Equipment Engineer Micron Technology IncSenior PCVD Equipment EngineerBoise, IDAs a Senior PVD/CVD (Physical Vapor Deposition and/or Chemical Vapor Deposition) Equipment Engineer , with a strong focus on safety and quality, you will play a meaningful role in improving our manufacturing processes by focusing on the installation, maintenance, optimization, and development of our PVD/CVD equipment. With plans to invest more than $150 billion globally over the next decade in groundbreaking manufacturing, we are looking for hardworking people to join our Boise expansion team and give to the growth and innovation of the semiconductor industry.
Implant Equipment Engineer Micron Technology IncImplant Equipment EngineerBoise, IDMicron Technology is a world leader in innovating memory and storage solutions that accelerate the transformation of information into intelligence, inspiring the world to learn, communicate and advance faster than ever. Fraud alert: Micron advises job seekers to be cautious of unsolicited job offers and to verify the authenticity of any communication claiming to be from Micron by checking the official Micron careers website in the About Micron Technology, Inc.
Equipment Engineer - Yield Technology Micron Technology IncEquipment Engineer - Yield TechnologyBoise, IDIn addition, the equipment engineer may be called on to help high volume manufacturing locations solve critical gap issues on optical and eBeam systems installed in production fabs. Fraud alert: Micron advises job seekers to be cautious of unsolicited job offers and to verify the authenticity of any communication claiming to be from Micron by checking the official Micron careers website in the About Micron Technology, Inc.
NewPrincipal/MTS Wet Process Development Engineer, DRAM Wet Process (Evergreen) Micron Technology IncPrincipal/MTS Wet Process Development Engineer, DRAM Wet Process (Evergreen)Boise, IDTechnical Leadership and Problem Solving - Lead development, optimization, and troubleshooting of advanced wet process applications from Wet cleans and etches, Vapor-phase processes, Strip processes, Bevel etch, to Copper plating. Micron Technology is a world leader in innovating memory and storage solutions that accelerate the transformation of information into intelligence, inspiring the world to learn, communicate and advance faster than ever.
NewDRAM Architect - Sr Engineer Micron Technology IncDRAM Architect - Sr EngineerBoise, IDMicron Technology is a world leader in innovating memory and storage solutions that accelerate the transformation of information into intelligence, inspiring the world to learn, communicate and advance faster than ever. Fraud alert: Micron advises job seekers to be cautious of unsolicited job offers and to verify the authenticity of any communication claiming to be from Micron by checking the official Micron careers website in the About Micron Technology, Inc.
NewDRAM Memory Design Engineer - Principal | MTS | SMTS Micron Technology IncDRAM Memory Design Engineer - Principal | MTS | SMTSBoise, IDBachelor's degree in Electrical Engineering or related field, plus MSEE with 10+ years, BSEE with 12+ years, or equivalent relevant semiconductor design experience; SMTS candidates typically have 15+ years of experience with demonstrated technical leadership. Fraud alert: Micron advises job seekers to be cautious of unsolicited job offers and to verify the authenticity of any communication claiming to be from Micron by checking the official Micron careers website in the About Micron Technology, Inc.
Principal Customer Integration Engineer, Product & Process Engineering (HBM) Micron Technology IncPrincipal Customer Integration Engineer, Product & Process Engineering (HBM)Boise, IDThis position emphasizes hands-on technical problem-solving, working with multi-functional groups, and enabling successful integration of advanced HBM products into customer systems. Micron Technology is a world leader in innovating memory and storage solutions that accelerate the transformation of information into intelligence, inspiring the world to learn, communicate and advance faster than ever.
NewEngineer- DRAM, Advanced DRAM and EM Device/Cell Technology Micron Technology IncEngineer- DRAM, Advanced DRAM and EM Device/Cell TechnologyBoise, IDCollaborate cross-functionally with process integration, design, and product engineering teams to translate device insights into technology and product improvements, enabling best-in-class memory solutions. Develop physical and electrical models (TCAD and compact modeling) to identify performance, yield and reliability limiters, using advanced materials characterization, device physics insight, and statistical data analysis.
NewDRAM Process Integration Engineer Micron Technology IncDRAM Process Integration EngineerBoise, IDResponsibilities: Lead technology integration activities to enable groundbreaking advanced memory devices, focusing on charge storage devices and thin-film transistors (TFTs). Micron Technology is a world leader in innovating memory and storage solutions that accelerate the transformation of information into intelligence, inspiring the world to learn, communicate and advance faster than ever.
NewSr Process Integration Engineer, DRAM Micron Technology IncSr Process Integration Engineer, DRAMBoise, IDMicron Technology is a world leader in innovating memory and storage solutions that accelerate the transformation of information into intelligence, inspiring the world to learn, communicate and advance faster than ever. Lead technology pathfinding activities to enable state-of-the-art device components, such as charge storage devices, hi-k/metal gate transistors, thin-film transistors (TFTs), among others.
Staff Engineer, Adv DRAM PI Micron Technology IncStaff Engineer, Adv DRAM PIBoise, IDMicron Technology is a world leader in innovating memory and storage solutions that accelerate the transformation of information into intelligence, inspiring the world to learn, communicate and advance faster than ever. Fraud alert: Micron advises job seekers to be cautious of unsolicited job offers and to verify the authenticity of any communication claiming to be from Micron by checking the official Micron careers website in the About Micron Technology, Inc.
NewSr. Node Development Product Engineer - DRAM Technology Micron Technology IncSr. Node Development Product Engineer - DRAM TechnologyBoise, IDFraud alert: Micron advises job seekers to be cautious of unsolicited job offers and to verify the authenticity of any communication claiming to be from Micron by checking the official Micron careers website in the About Micron Technology, Inc. Micron Technology is a world leader in innovating memory and storage solutions that accelerate the transformation of information into intelligence, inspiring the world to learn, communicate and advance faster than ever.
NewMTS Lead DRAM Device Engineer Micron Technology IncMTS Lead DRAM Device EngineerBoise, IDWe partner across Process Integration, Design, Product Engineering, Quality, and Failure Analysis to solve complex technical challenges, improve product performance, and enable successful technology transitions. Micron Technology is a world leader in innovating memory and storage solutions that accelerate the transformation of information into intelligence, inspiring the world to learn, communicate and advance faster than ever.
NewSTAFF ENGINEER, DRY ETCH DRAM Micron Technology IncSTAFF ENGINEER, DRY ETCH DRAMBoise, IDFraud alert: Micron advises job seekers to be cautious of unsolicited job offers and to verify the authenticity of any communication claiming to be from Micron by checking the official Micron careers website in the About Micron Technology, Inc. Micron Technology is a world leader in innovating memory and storage solutions that accelerate the transformation of information into intelligence, inspiring the world to learn, communicate and advance faster than ever.
NewStaff Verification Design Engineer, DRAM Micron Technology IncStaff Verification Design Engineer, DRAMBoise, IDFraud alert: Micron advises job seekers to be cautious of unsolicited job offers and to verify the authenticity of any communication claiming to be from Micron by checking the official Micron careers website in the About Micron Technology, Inc. Micron Technology is a world leader in innovating memory and storage solutions that accelerate the transformation of information into intelligence, inspiring the world to learn, communicate and advance faster than ever.
NewSr. Circuit Design Engineer - DRAM Design Micron Technology IncSr. Circuit Design Engineer - DRAM DesignBoise, IDFraud alert: Micron advises job seekers to be cautious of unsolicited job offers and to verify the authenticity of any communication claiming to be from Micron by checking the official Micron careers website in the About Micron Technology, Inc. Micron Technology is a world leader in innovating memory and storage solutions that accelerate the transformation of information into intelligence, inspiring the world to learn, communicate and advance faster than ever.
NewSemiconductor Design Engineer, DRAM: Senior, Staff, or Principal Micron Technology IncSemiconductor Design Engineer, DRAM: Senior, Staff, or PrincipalBoise, IDFraud alert: Micron advises job seekers to be cautious of unsolicited job offers and to verify the authenticity of any communication claiming to be from Micron by checking the official Micron careers website in the About Micron Technology, Inc. Micron Technology is a world leader in innovating memory and storage solutions that accelerate the transformation of information into intelligence, inspiring the world to learn, communicate and advance faster than ever.
NewSr Engineer, Adv DRAM PI Micron Technology IncSr Engineer, Adv DRAM PIBoise, IDLead technology integration activities to enable brand new layered memory devices, focusing on components like charge storage devices and thin-film transistors (TFTs). Micron Technology is a world leader in innovating memory and storage solutions that accelerate the transformation of information into intelligence, inspiring the world to learn, communicate and advance faster than ever.
DRAM Architect – Principal Engineer | MTS - TPG Micron Technology IncDRAM Architect – Principal Engineer | MTS - TPGBoise, IDMicron Technology is a world leader in innovating memory and storage solutions that accelerate the transformation of information into intelligence, inspiring the world to learn, communicate and advance faster than ever. Fraud alert: Micron advises job seekers to be cautious of unsolicited job offers and to verify the authenticity of any communication claiming to be from Micron by checking the official Micron careers website in the About Micron Technology, Inc.
NewPrincipal Engineer Photolithography DRAM Process Development (Evergreen) Micron Technology IncPrincipal Engineer Photolithography DRAM Process Development (Evergreen)Boise, IDMicron Technology is a world leader in innovating memory and storage solutions that accelerate the transformation of information into intelligence, inspiring the world to learn, communicate and advance faster than ever. Fraud alert: Micron advises job seekers to be cautious of unsolicited job offers and to verify the authenticity of any communication claiming to be from Micron by checking the official Micron careers website in the About Micron Technology, Inc.
NewInside Sales Rep United RentalsInside Sales RepBoise, IDAs an Inside Sales Rep, you will serve as a key customer contact and consultant at our Fluid Solutions branch, with responsibility for recommending solutions to the customer, quoting, selling and fulfilling orders for our equipment and services based on their needs. We're an award-winning company (recently named a Glassdoor Best Place to Work in 2026) that truly cares about our people - That's why we offer best-in-class benefits and perks that will support you and your family.
Senior II Solutions Engineer Akamai Technologies, Inc.Senior II Solutions EngineerBoise, ID$139,300–$250,700 / yearFor US based candidates only - the base salary for this position ranges from $139,300 - $250,700/year; a candidate’s salary is determined by various factors including, but not limited to, relevant work experience, skills, certifications and location. We provide the world's most distributed platform from Cloud to Edge to help the giants of the digital world work faster and stay more secure, making the internet a better experience for everyone.
Solutions Engineer II Akamai Technologies, Inc.Solutions Engineer IIBoise, ID$100,700–$181,300 / yearFor US based candidates only - the base salary for this position ranges from $100,700 - $181,300/year; a candidate’s salary is determined by various factors including, but not limited to, relevant work experience, skills, certifications and location. We provide the world's most distributed platform from Cloud to Edge to help the giants of the digital world work faster and stay more secure, making the internet a better experience for everyone.
Principal Customer Solutions Engineer Rocket SoftwarePrincipal Customer Solutions EngineerBoise, IDRemoteThe Customer Solutions Engineer a highly skilled Mainframe Modernization Senior Consultant to provide technical support and/or leadership in the creation and delivery of technology solutions designed to support our Customers’ Digital Transformation. + Relevant Business and IT Architecture Certifications such as, AWS Solution Architect Professional, Microsoft AZURE Solution Architect, Google Cloud Certification; Scaled Agile Framework (SAFe) etc.
Senior Solutions Engineer - Microsoft Azure Compunet, Inc.Senior Solutions Engineer - Microsoft AzureMeridian, ID$100,000–$175,000 / yearSolution Architecture: Leverage broad and deep technology knowledge to architect solutions that meet client business requirements, focusing on operational effectiveness and business value. Experience in customer-facing roles with demonstrated capability in clearly presenting thoughts and ideas confidently to audiences of various sizes and technical knowledge levels.
Senior Solutions Engineer (Hybrid) Cable One IncSenior Solutions Engineer (Hybrid)Boise, IDDevelop long-haul and metro fiber solutions with detailed designs covering ILA builds, POPs, OSP/ISP integration, and diverse routing paths. Cable One and our family of brands appreciates the role our associates play to help the company grow, and in return an excellent benefits package is offered to our associates to recognize the importance of their contributions, such as: Medical, dental, and vision plans - start when you start!
Senior Customer Solutions Engineer Rocket SoftwareSenior Customer Solutions EngineerBoise, IDRemote$105,000–$141,750 / yearOur Enterprise Suite Professional Services Team is looking for a highly skilled Mainframe Modernization Senior Consultant to provide technical support and/or leadership in the creation and delivery of technology solutions designed to support our Customers’ Digital Transformation. The candidate will also be able to deploy fit for purpose workload in a Hybrid Cloud infrastructure, evolve from monolithic application to Cloud-Native API Microservices, and embrace an enterprise-wide DevOps discipline to deliver application faster.
Engineer, Agentic Solutions Micron Technology IncEngineer, Agentic SolutionsBoise, ID$90,000–$192,000 / yearPrototype agentic workflows that support engineering use cases (e.g., spec interpretation, design/verification support, test-log triage) using modern agent frameworks and structured evaluation loops. Micron Technology is a world leader in innovating memory and storage solutions that accelerate the transformation of information into intelligence, inspiring the world to learn, communicate and advance faster than ever.
Senior or Staff Engineer, Advanced Modeling & AI Solutions MicronSenior or Staff Engineer, Advanced Modeling & AI SolutionsBoise, IdahoMicron Technology is a world leader in innovating memory and storage solutions that accelerate the transformation of information into intelligence, inspiring the world to learn, communicate and advance faster than ever. Fraud alert: Micron advises job seekers to be cautious of unsolicited job offers and to verify the authenticity of any communication claiming to be from Micron by checking the official Micron careers website in the About Micron Technology, Inc.
Senior Engineer, Advanced Modeling & AI Solutions MicronSenior Engineer, Advanced Modeling & AI SolutionsBoise, IdahoMicron Technology is a world leader in innovating memory and storage solutions that accelerate the transformation of information into intelligence, inspiring the world to learn, communicate and advance faster than ever. Fraud alert: Micron advises job seekers to be cautious of unsolicited job offers and to verify the authenticity of any communication claiming to be from Micron by checking the official Micron careers website in the About Micron Technology, Inc.
Senior or Staff Engineer, Advanced Modeling & AI Solutions Micron Technology IncSenior or Staff Engineer, Advanced Modeling & AI SolutionsBoise, IDMicron Technology is a world leader in innovating memory and storage solutions that accelerate the transformation of information into intelligence, inspiring the world to learn, communicate and advance faster than ever. Fraud alert: Micron advises job seekers to be cautious of unsolicited job offers and to verify the authenticity of any communication claiming to be from Micron by checking the official Micron careers website in the About Micron Technology, Inc.
Senior Engineer, Advanced Modeling & AI Solutions Micron Technology, Inc.Senior Engineer, Advanced Modeling & AI SolutionsBoise, IDMicron Technology is a world leader in innovating memory and storage solutions that accelerate the transformation of information into intelligence, inspiring the world to learn, communicate and advance faster than ever. Fraud alert: Micron advises job seekers to be cautious of unsolicited job offers and to verify the authenticity of any communication claiming to be from Micron by checking the official Micron careers website in the About Micron Technology, Inc.
Senior Or Staff Engineer, Advanced Modeling & AI Solutions Micron Technology, Inc.Senior Or Staff Engineer, Advanced Modeling & AI SolutionsBoise, IDMicron Technology is a world leader in innovating memory and storage solutions that accelerate the transformation of information into intelligence, inspiring the world to learn, communicate and advance faster than ever. Fraud alert: Micron advises job seekers to be cautious of unsolicited job offers and to verify the authenticity of any communication claiming to be from Micron by checking the official Micron careers website in the About Micron Technology, Inc.
Lead Solutions Design Engineer - SIMIO Warehouse & Transportation Simulation (REMOTE) Ryder System IncLead Solutions Design Engineer - SIMIO Warehouse & Transportation Simulation (REMOTE)Boise, IDRemote$100,000–$115,000 / yearWarehouse Design:Extensive knowledge of Warehouse Management operations, data analytics, Industrial Engineering, warehouse types (ambient, temp control, warehouse layout/ design and Lean methodsRequired knowledge of material handling solutions and automation types such as: powered industrial truck (PIT) applications; racking and other storage solution designs, packaging equipment; conveyor and sortation equipment; and other automation solutions (e.gAS/RS)Warehouse Design Tools e.g. Transportation Design:Extensive knowledge of Dedicated Services and Managed Transportation NetworksRequired knowledge of all available equipment types such as; dry van, temperature control, flat bed, other specialized equipmentTransportation Design Tools ie; JDA, Appian, Network Design Tools ie; Llamasoft, Transportation Management Systems ie; JDA, OTM,, Mapping Software ie; Tableau expert required.
Transportation Lead Solutions Design Engineer (remote) Ryder System IncTransportation Lead Solutions Design Engineer (remote)Boise, IDRemoteTransportation Design:Extensive knowledge of Dedicated Services and Managed Transportation NetworksRequired knowledge of all available equipment types such as; dry van, temperature control, flat bed, other specialized equipmentTransportation Design Tools ie; Blue Yonder Transportation Modeler, Appian, Network Design Tools ie; Llamasoft/Optilogic, Transportation Management Systems ie; Blue Yonder, OTM, Mapping Software ie; Power BI expert required. Transportation Design:Extensive knowledge of Dedicated Services and Managed Transportation NetworksRequired knowledge of all available equipment types such as; dry van, temperature control, flat bed, other specialized equipmentTransportation Design Tools ie; JDA, Appian, Network Design Tools ie; Llamasoft/Optilogic, Transportation Management Systems ie; Blue Yonder, OTM, Mapping Software ie; Power BI expert required.
Americas Wafer Test Solutions Engineering Manager Keysight Technologies IncAmericas Wafer Test Solutions Engineering ManagerBoise, IDOur ~15,000 employees create world-class solutions in communications, 5G, automotive, energy, quantum, aerospace, defense, and semiconductor markets for customers in over 100 countries. The Solutions Engineering team is our key technical resource allowing Keysight to deliver high-performance, high-efficiency, and high-uptime solutions to our customers.
Sales Specialist, Fraud Solutions TransunionSales Specialist, Fraud SolutionsEagle, IDYou will be responsible for hitting revenue targets by building an account development plan and working with your regional counterparts (regional markets and teams) and the global solutions organization to craft account strategies and generate new "Fraud and ID" revenue. As a trusted provider of global information solutions, our mission is to help people around the world access the opportunities that lead to a higher quality of life, by helping organizations optimize their risk-based decisions and enabling consumers to understand and manage their personal information.
Business Technology Solutions Lead (Boise, ID) Simplot Australia Pty. Ltd.Business Technology Solutions Lead (Boise, ID)Boise, IDSuccess is achieved through participating in-and at times leading-operational excellence initiatives that result in reliable and user friendly operational and location reporting, reduced manual work and rework through effective system integration and automation, and strong adoption of new or improved technology by location users. As part of the AgriBusiness Technology Program, the Business Technology Solutions Lead is an individual contributor who partners with stakeholders to define, design and deliver integrated, technology enabled solutions aligned to Agribusiness business strategy.
Customer Technology & Solutions Architecture MicronCustomer Technology & Solutions ArchitectureBoise, IdahoAs part of Customer Technology & Solutions Architecture, you will lead hands-on technical engagements with key customers, help define solutions across memory, packaging, and systems, and ensure customer needs are clearly translated into internal product and technology decisions. Micron Technology is a world leader in innovating memory and storage solutions that accelerate the transformation of information into intelligence, inspiring the world to learn, communicate and advance faster than ever.
Customer Technology & Solutions Architecture Micron Technology IncCustomer Technology & Solutions ArchitectureBoise, IDAs part of Customer Technology & Solutions Architecture, you will lead hands-on technical engagements with key customers, help define solutions across memory, packaging, and systems, and ensure customer needs are clearly translated into internal product and technology decisions. Micron Technology is a world leader in innovating memory and storage solutions that accelerate the transformation of information into intelligence, inspiring the world to learn, communicate and advance faster than ever.
Senior Solutions Architect - AI and Emerging Technologies MicronSenior Solutions Architect - AI and Emerging TechnologiesBoise, IdahoMicron Technology is a world leader in innovating memory and storage solutions that accelerate the transformation of information into intelligence, inspiring the world to learn, communicate and advance faster than ever. You’ll mentor global teams, guide technology adoption, and create frameworks that empower both engineers and citizen developers to deliver high-impact solutions.
Systems Solutions Manager Daikin Applied Americas Inc.Systems Solutions ManagerIDRemoteWhat you will do: Innovation & Roadmap Influence - Translate customer pain points into differentiated, integrated HVAC solutions strategies and drive alignment with business units and other internal stakeholders to shape product and solutions roadmaps based on an aligned system strategy, ensuring delivery of high-value, system-level innovations that support our strategic system story narratives. Thought leadership & content creation - Aligned with new product and solutions introductions, develop high-impact technical content (white papers, webinars, presentations, and publications) that communicates system-level value to the market, educating and influencing the adoption of Daikin solutions by customers.
Senior Solutions Architect - AI and Emerging Technologies Micron Technology IncSenior Solutions Architect - AI and Emerging TechnologiesBoise, IDMicron Technology is a world leader in innovating memory and storage solutions that accelerate the transformation of information into intelligence, inspiring the world to learn, communicate and advance faster than ever. You'll mentor global teams, guide technology adoption, and create frameworks that empower both engineers and citizen developers to deliver high-impact solutions.