Maintenance Engineering jobs in Rossendale

Displaying 1-50 of 1,135 jobs

Refine search

Your current filters

Remove search filter maintenance engineering Remove search filter Rossendale, Lancashire (up to 35 miles) Clear all Clear all filters

The position you are looking for is no longer available, but here are some similar jobs that might interest you

  1. Mobile Plant Maintenance Engineer

    Posted a week ago by Veolia

    Featured job Video job
    Salary:
    £38,500/annum
    Location:
    Runcorn, Cheshire (30 miles)
    Job Type:
    Permanent

    As a Mobile Plant Maintenance Engineer you'll be pushing for innovative solutions to create a more sustainable future for all. We know that everyone here at Veolia can help us work alongside our communities, look after the environment, and contribute to our inclusive culture. What … more

    Apply Now
  2. Maintenance Engineer

    Posted 5 days ago by Greencore

    Featured job
    Location:
    Crosby, Merseyside (34 miles)
    Job Type:
    Permanent

    Are you an experienced multiskilled maintenance engineer from an FMCG/Food background looking for a new challenge. We are currently recruiting for an Engineer at our Park Royal site. As one of our highly skilled maintenance engineers you will be … more

    Apply Now
  3. Maintenance Engineer

    Posted 6 days ago by Pioneer Selection Ltd

    Salary:
    £43,890/annum Pension and Healthcare
    Location:
    Accrington (6 miles)
    Job Type:
    Permanent

    Maintenance Engineer. I am looking for a Maintenance Engineer to join my client busy factory in Accrington, they are a market leader in their field and are currently going through quite a lot of expansion. They are now looking for a Maintenance more

    Apply Now
  4. Engineering Maintenance Trainer

    Posted a week ago by Barnsley College

    Salary:
    £33,179 - £38,452/annum
    Location:
    S70, Barnsley, South Yorkshire (33 miles)
    Job Type:
    Permanent

    Engineering Maintenance Trainer - Barnsley College - Permanent – £33,179 to £38,452 per annum. FULL TIME OR PART TIME (3 DAYS MINIMUM) CONSIDERED. As skilled workers are in short supply in every single type of Engineering from Mechanical to Civil, this is an exciting time … more

    Apply Now
  5. Maintenance Engineer

    Posted a week ago by Pioneer Selection Ltd

    Salary:
    £36,000 - £39,000/annum Benefits
    Location:
    Todmorden (7 miles)
    Job Type:
    Permanent

    Maintenance Engineer - MONDAY-FRIDAY. Salary: £36,000-£39,000. Location: Todmorden, West Yorkshire. A large multi-site industrial manufacturing company is looking for a Maintenance Engineer to join the team at their fully automated factory in West Yorkshire. The < … more

    Apply Now
  6. Maintenance Engineer

    Posted 4 days ago by Axion Recruitment

    Quick apply
    Salary:
    £40,000/annum
    Location:
    Manchester, Greater Manchester (14 miles)
    Job Type:
    Permanent

    Maintenance Engineer. Maintenance Engineer. Manchester. Days and Nights. Processing company. £40,000. We are working with an established FMCG manufacturing company based in Hinckley. They are recruiting for a Maintenance Engineer to join their … more

  7. Maintenance Engineer

    Posted 4 days ago by Axion Recruitment

    Quick apply
    Salary:
    £40,000 - £50,000/annum
    Location:
    Leigh, Borough of Wigan (16 miles)
    Job Type:
    Permanent

    Maintenance Engineer. Maintenance Engineer. Leigh. Days, Monday-Friday. Processing Company. £40,000 - £50,000. We are working with an established processing company based in Hinckley. They are recruiting for a Maintenance Engineer to join their … more

  8. Maintenance Engineer

    Posted 09/04/2024 by Pioneer Selection Ltd

    Salary:
    £48,000/annum Benefits Package
    Location:
    Halifax (16 miles)
    Job Type:
    Permanent

    Maintenance Engineer. Salary: £47,000. Shift: Mon - Fri Perm Nights. Location: Halifax, West Yorkshire. I'm currently recruiting for a Multi Skilled Maintenance Engineer position at an Industrial Manufacturing Company in the Halifax. I'm in search of a Multi … more

    Apply Now
  9. Maintenance Engineer

    Posted a week ago by GPS Recruitment

    Quick apply
    Salary:
    £45,000 - £50,000/annum
    Location:
    Halifax, Calderdale (17 miles)
    Job Type:
    Permanent

    Role: Multi-Skilled Maintenance Engineer. Location: Halifax. Shift: Permanent Nightshift. Salary: Upto 48K (Neg on experience. GPS are looking for a highly motivated Multi-Skilled Maintenance Engineer to work for a leading PVC manufacturer working a permanent … more

  10. Maintenance Engineer

    Posted a week ago by Pioneer Selection Ltd

    Salary:
    £51,000/annum Benefits
    Location:
    Elland (17 miles)
    Job Type:
    Permanent

    Maintenance Engineer - INDUSTRIAL MANUFACTURING. Salary: £51,000. Location: Elland, West Yorkshire. A large multi-site industrial manufacturing company is looking for a Maintenance Engineer to join the team at their fully automated factory in West Yorkshire. The < … more

    Apply Now
  11. Maintenance Engineer

    Posted 02/04/2024 by Axion Recruitment

    Quick apply
    Salary:
    £38,000 - £42,000/annum
    Location:
    Sale, Trafford (18 miles)
    Job Type:
    Permanent

    Electrical Bias Maintenance Engineer. Sale, Greater Manchester. Days - Mon-Fri (Early Finish on Friday. £38,000 - £42,000 (Plus excellent benefits. We are working with an established Plastics Manufacturer based in Sale, Greater Manchester. They are recruiting for a Electrical Bias … more

  12. Maintenance Engineer

    Posted a week ago by Pioneer Selection Ltd

    Salary:
    £45,526/annum
    Location:
    Leyland (17 miles)
    Job Type:
    Permanent

    Multi-Skilled Maintenance Engineer - State of the Art Factory. Salary: £45,000 - £45,500. OTE: £50,000. Location: Leyland, Lancashire. A fantastic opportunity which is not to be missed by strong maintenance engineer has come to the forefront. This is going to be … more

    Apply Now
  13. Maintenance Engineer

    Posted 04/04/2024 by Pioneer Selection Ltd

    Salary:
    £44,000/annum Benefits Package
    Location:
    Croston (20 miles)
    Job Type:
    Permanent

    Maintenance Engineer - Industrial Manufacturing. Salary: £44,000. Location: Croston, Lancashire. A market leading industrial company are looking for a Maintenance Engineer to join the team at their fully automated, high speed manufacturing facility in Lancashire. … more

    Apply Now
  14. Maintenance Engineer

    Posted 02/04/2024 by Stirling Warrington

    Salary:
    £44,000 - £52,000/annum
    Location:
    Salford, Cheshire, North West (12 miles)
    Job Type:
    Permanent

    Maintenance Engineer - Multi Skilled. Salford, Manchester. £44,000 - £52,000. 4 On 4 Off. Benefits. Training provided on day 1. Brand new site with state – of – the – art, multimillion-pound production lines, chance to be one of the first engineers through the door … more

    Apply Now
  15. Maintenance Engineer

    Posted 4 days ago by Axion Recruitment

    Quick apply
    Salary:
    £45,000 - £50,000/annum
    Location:
    Warrington, Cheshire (23 miles)
    Job Type:
    Permanent

    Maintenance Engineer. Maintenance Engineer. Warrington. Afternoon Shift (3pm – 11.30pm. Food Manufacturer. £45,000 - £50,000. We are working with an established food manufacturing company based in Warrington. They are recruiting for a Maintenance more

  16. Maintenance Engineer

    Posted 4 days ago by The Sterling Choice

    Salary:
    £45,000 - £47,500/annum
    Location:
    Nelson (10 miles)
    Job Type:
    Permanent

    Maintenance Engineer - Food Manufacturing. Multi-Skilled Maintenance. Days based shift pattern. Overview. This is a great opportunity for a maintenance engineer who is looking to move in to a shift pattern containing no nights. One of the areas well know … more

    Apply Now
  17. Maintenance Engineer

    Posted 08/04/2024 by Apex Appoint

    Quick apply
    Salary:
    £38,000 - £45,000/annum Days only- Mon-Fri
    Location:
    SK22, Birch Vale, Derbyshire (24 miles)
    Job Type:
    Permanent

    Maintenance Engineer. Shifts: Monday to Friday - 0730-1630. Salary: £40,000 - £45,000. Qualifications or Functional Experience. Formal engineering trades apprenticeship. Special knowledge of hydraulics, pneumatics, electrics, electronics, mechanical, PLC, and plant- … more

  18. Maintenance Engineer

    Posted a week ago by Axion Recruitment

    Quick apply
    Salary:
    £36,500 - £40,000/annum
    Location:
    Knutsford, Cheshire East (26 miles)
    Job Type:
    Permanent

    Maintenance Engineer. Maintenance Engineer. Knutsford. Days, Monday-Friday. Bespoke Product Manufacturing Company. £36,500 - £40,000. We are working with an established bespoke product manufacturing company based in Knutsford. They are recruiting for a more

  19. Maintenance Engineer

    Posted 5 days ago by Proslipsi Recruitment Specialist

    Salary:
    £38,000 - £40,000/annum Neg DOE + exc benefits
    Location:
    Rochdale, Greater Manchester (6 miles)
    Job Type:
    Permanent

    My client, a specialist high precision component and machine manufacturer, have a fantastic opportunity for a Maintenance Engineer. What's on offer. Days and early shifts with early finish on Fridays to enjoy the weekend. up to 40k basic for day shifts NEG. Overtime available. … more

    Apply Now
  20. Maintenance Engineer

    Posted a week ago by Pioneer Selection Ltd

    Salary:
    £41,000/annum Benefits
    Location:
    Morley (27 miles)
    Job Type:
    Permanent

    Maintenance Engineer - INDUSTRIAL MANUFACTURING. Salary: £41,000. Location: Morley, West Yorkshire. A large multi-site industrial manufacturing company is looking for a Maintenance Engineer to join the team at their fully automated factory in West Yorkshire. The < … more

    Apply Now
  21. Maintenance Engineer

    Posted 11/04/2024 by Axion Recruitment

    Quick apply
    Salary:
    £37,000/annum
    Location:
    Leeds, West Yorkshire (30 miles)
    Job Type:
    Permanent

    Multiskilled Maintenance Engineer. Multiskilled Maintenance Engineer (Elec bias. Leeds. Two shift pattern. FMCG industry. £37,000. We are working with an established company in the FMCG industry that specialises in products for clients around the country. They are … more

  22. Maintenance Engineer

    Posted 12/04/2024 by Employment Solutions Ltd

    Salary:
    £39,708/annum BH, Pension, Health Cash
    Location:
    Burnley, Lancashire (8 miles)
    Job Type:
    Permanent

    Introduction: Join a dynamic team as a Maintenance Engineer, working in a leading engineering environment. responsible for installing, maintaining, and repairing equipment to ensure efficient production within a safe environment. Ideal for individuals with mechanical and … more

    Apply Now
  23. Maintenance Engineer

    Posted 12/04/2024 by Blue Oak Recruitment

    Salary:
    £48,000/annum Plus Overtime
    Location:
    Wigan, Greater Manchester (17 miles)
    Job Type:
    Permanent

    We are recruiting for a Mechanical Maintenance Engineer and are open to all levels of experience. With a large Engineering team, they are able to bring in a highly experienced engineer or a newly qualified apprentice. Working on a continental shift pattern (2 days … more

    Apply Now
  24. Maintenance Engineer

    Posted a week ago by Pioneer Selection Ltd

    Salary:
    £46,000 - £48,000/annum
    Location:
    Urmston (15 miles)
    Job Type:
    Permanent

    Maintenance Engineer - DAYS ONLY. Salary: £46,000-£48,000. Location: Urmston. A globally renowned manufacturer of products which is used in a wide variety of industries currently have an opening for a Maintenance Engineer within their highly automated state-of-the … more

    Apply Now
  25. Maintenance Engineer

    Posted a week ago by Stirling Warrington

    Salary:
    £32,000/annum
    Location:
    Bradford, West Yorkshire, Yorkshire (22 miles)
    Job Type:
    Permanent

    Maintenance Engineer. Bradford, West Yorkshire. £32000. Days – 7.30am – 3.30pm. Benefits. Enhanced company pension. Overtime available – paid at time and a half Saturdays and double Sundays. My client is looking for an experienced maintenance engineer to work on a … more

    Apply Now
  26. Maintenance Engineer

    Posted a week ago by Leader Group

    Salary:
    £43,000 - £43,680/annum
    Location:
    Keighley, West Yorkshire (19 miles)
    Job Type:
    Permanent

    Maintenance Engineer. Dairy Environment. Keighley / Grassington. £43,680 per annum. Leader industrial are working with a well established processing dairy in Keighley and Grassington. The business currently produces & distributes milk, along with other associated dairy products, … more

    Apply Now
  27. Maintenance Engineer

    Posted 4 days ago by Probe UK

    Quick apply
    Salary:
    £48,369/annum + Overtime, Pension
    Location:
    WN6, Standish, Borough of Wigan (17 miles)
    Job Type:
    Permanent

    Exciting opportunity to join a specialist manufacturing organisation based in Greater Manchester, an opportunity for a Maintenance engineer to join an already established maintenance team and an organisation that continues to grow and have great plans for the future. This … more

  28. Maintenance Engineer

    Posted a week ago by Probe UK

    Quick apply
    Salary:
    £38,196/annum + Pension, Life Assurance
    Location:
    BB3, Darwen, Blackburn with Darwen (7 miles)
    Job Type:
    Permanent

    We are currently assisting a Leading Global Engineering organisations based in North-West, we are assisting in their search for a Multi-skilled Maintenance Engineer – Mechanically Biased to join the already Established Maintenance team. Are you ready to join an … more

  29. Maintenance engineer

    Posted 03/04/2024 by Rise Technical Recruitment

    Salary:
    £35,000/annum
    Location:
    Bradford, West Yorkshire (22 miles)
    Job Type:
    Permanent

    Mechanical Maintenance Engineer. £35,000 + Training + Overtime (1.5x) + Progression + Excellent Benefits + Training on bespoke machinery. Bradford, Commutable from Leeds, Huddersfield, Harrogate, Dewsbury, Castleford. Are you a Maintenance Engineer looking to join … more

    Apply Now
  30. Maintenance Engineer

    Posted 08/04/2024 by Premier Technical Recruitment

    Salary:
    £41,000 - £45,000/annum car + benefits
    Location:
    Manchester, Greater Manchester (14 miles)
    Job Type:
    Permanent

    Maintenance Engineer. Manchester region. To c£45k + vehicle + benefits (neg dep exp. Our client is recognised as a market leader in the manufacture and supply of bespoke specialist fire rated glass solutions to a diverse range of clients throughout the UK, and as a result of … more

    Apply Now
  31. Maintenance Engineer

    Posted 08/04/2024 by Premier Technical Recruitment

    Salary:
    £41,000 - £45,000/annum car + benefits
    Location:
    Manchester, Greater Manchester (14 miles)
    Job Type:
    Permanent

    Maintenance Engineer. Manchester region. To c£45k + vehicle + benefits (neg dep exp. Our client is recognised as a market leader in the manufacture and supply of bespoke specialist fire rated glass solutions to a diverse range of clients throughout the UK, and as a result of … more

    Apply Now
  32. Maintenance Engineer

    Posted 08/04/2024 by Premier Technical Recruitment

    Salary:
    £41,000 - £45,000/annum car + benefits
    Location:
    Manchester, Greater Manchester (14 miles)
    Job Type:
    Permanent

    Maintenance Engineer. Manchester region. To c£45k + vehicle + benefits (neg dep exp. Our client is recognised as a market leader in the manufacture and supply of bespoke specialist fire rated glass solutions to a diverse range of clients throughout the UK, and as a result of … more

    Apply Now
  33. Maintenance Engineer

    Posted 02/04/2024 by Premier Technical Recruitment

    Salary:
    £41,000 - £45,000/annum car + benefits
    Location:
    Manchester, Greater Manchester (14 miles)
    Job Type:
    Permanent

    Maintenance Engineer. Manchester region. To c£45k + vehicle + benefits (neg dep exp. Our client is recognised as a market leader in the manufacture and supply of bespoke specialist fire rated glass solutions to a diverse range of clients throughout the UK, and as a result of … more

    Apply Now
  34. Maintenance Engineer

    Posted 11/04/2024 by Recruit4staff LTD

    Salary:
    £45,000 - £50,000/annum Permanent Role, Competitive Salary,
    Location:
    Bradford (22 miles)
    Job Type:
    Permanent

    Recruit4staff are proud to be representing their client, a leading manufacturing business in their search for Mechanically Bias Maintenance Engineers to work in their leading facility in Bradford. For the successful Maintenance Engineer our client is offering. … more

    Apply Now
  35. Maintenance Engineer

    Posted 4 days ago by Rotherwood

    Salary:
    £17.50/hour
    Location:
    BD21, Keighley, Bradford (19 miles)
    Job Type:
    Permanent

    Our client based in Grassington is looking to recruit a Maintenance Engineer on a full time, permanent basis to work at their sites in Keighley and Grassington. Duties will include. To provide electrical and mechanical maintenance to a range of machinery including shrink … more

    Apply Now
  36. Maintenance Engineer

    Posted 2 days ago by E3 Recruitment

    Salary:
    £37,500/annum Development opportunities
    Location:
    Pudsey, West Yorkshire (26 miles)
    Job Type:
    Permanent

    Maintenance Engineer required to join a long standing, manufacturing giant with multiple sites. Overtime paid at premium rates, 33 days annual leave and a company pension scheme. This impressive business offers continued training and development courses, ultimately providing a … more

    Apply Now
  37. Maintenance Engineer

    Posted 4 days ago by Stirling Warrington

    Salary:
    £38,000 - £45,000/annum
    Location:
    Bolton, Greater Manchester, North West (10 miles)
    Job Type:
    Permanent

    Maintenance Engineer - Electrical Bias. Preston, Lancashire. £38,000. 8:30-4:30 Mon-Thu 8:30-1:30 Fri. Benefits. Free on-site parking. Average earnings of £45,000. Great healthcare system. Overtime opportunities (1.5x Mon-sat 2x Sun. Day shifts with an early finish on Friday, no … more

    Apply Now
  38. Maintenance Engineer

    Posted 11/04/2024 by Ford & Stanley Recruitment

    Location:
    Manchester (14 miles)
    Job Type:
    Permanent

    Requirement for a Maintenance Engineer to work for a leading manufacturer in the rolling stock industry, delivering a new fleet of trains according to strict timescales while reporting locally into the Operations Manager. Situation. Ford & Stanley Recruitment are partnered with a … more

    Apply Now
  39. Maintenance Engineer

    Posted 04/04/2024 by Stirling Warrington

    Salary:
    £41,000 - £46,500/annum
    Location:
    Middlewich, Cheshire, North West (31 miles)
    Job Type:
    Permanent

    Maintenance Engineer. Cheshire, Middlewich. £41,000 - £46,500 (Overtime Available. Days - 6am - 4pm. Benefits. Days Monday - Friday with optional overtime of x1.5 on Saturday and x2 on Sunday. Free on-site parking. Training offered from day 1. Weekly bonuses included. We are … more

    Apply Now
  40. Maintenance Engineer

    Posted a week ago by E3 Recruitment

    Salary:
    £50,000 - £500,000/annum
    Location:
    Bradford, West Yorkshire (22 miles)
    Job Type:
    Permanent

    A Maintenance Engineer is required to join a global food manufacturer based in Bradford, West Yorkshire. This opportunity is operating on a 4 on 4 off shift days and nights pattern and paying £50,000 per annum. Benefits offered to the successful individual include 2 x life … more

    Apply Now
  41. Maintenance Engineer

    Posted 6 days ago by Advantage Resourcing

    Salary:
    £32 - £35/hour
    Location:
    Wigan, Greater Manchester (17 miles)
    Job Type:
    Contract

    Maintenance Engineer. £32 - £35 Umbrella. 12 month. Bolton - Fully onsite role. Role responsibilities. We are seeking a Maintenance Engineer to join our Calibration & Maintenance Team. The main aspects of the role are supporting operations team's … more

    Apply Now
  42. Maintenance Engineer

    Posted 05/04/2024 by Employment Solutions Ltd

    Salary:
    £43,000 - £49,000/annum 5% pension, Death in Service, Overti
    Location:
    Rossendale, Lancashire
    Job Type:
    Permanent

    We're seeking a dynamic Multi-skilled Engineer with an electrical bias to join a growing client based in the Rawtenstall area. Working for a forward-thinking manufacturing company, who are in their latest stage of investment in their plant. Working as part of a fantastic team under a … more

    Apply Now
  43. Maintenance Engineer

    Posted 3 days ago by ATA Recruitment

    Location:
    Leeds (27 miles)
    Job Type:
    Permanent

    Role: Maintenance Engineer - Electrical Bias. Salary: £41,000 - £41,000. Location: Leeds. Shift pattern: 4 on 4 off. Holidays: 28 days. ATA Recruitment have an opportunity available for a motivated maintenance engineer who is looking to advance their career in <em … more

    Apply Now
  44. Maintenance Engineer

    Posted 2 days ago by The Recruitment Co.

    Salary:
    £44,880/annum
    Location:
    Barnsley, South Yorkshire (33 miles)
    Job Type:
    Permanent

    Our Client is looking to recruit a Multi-skilled Maintenance Team Leader with a background in machine repair, PPM and problem solving at their Goldthorpe Distribution site. What you can expect in this role. Leading a team of Engineers to complete planned and preventative more

    Apply Now
  45. Maintenance Engineer

    Posted 5 days ago by Stirling Warrington

    Salary:
    £37,000 - £42,000/annum
    Location:
    Bolton, Greater Manchester, North West (9 miles)
    Job Type:
    Permanent

    Maintenance Engineer. Bolton, Greater Manchester. £37,000 - £42,000. 6am - 2pm / 2pm - 10pm (Double Days Mon - Fri. Benefits. In-house training from day 1. Overtime opportunities. Free on-site parking. Day shifts, no weekends. We are looking for an hungry Maintenance more

    Apply Now
  46. Maintenance Engineer

    Posted 11/04/2024 by The Sterling Choice

    Salary:
    £40,000 - £45,000/annum
    Location:
    Macclesfield (29 miles)
    Job Type:
    Permanent

    Maintenance Engineer - Food Manufacturing. Electrical Bias. Monday - Friday Double days shift pattern. Overview. An opportunity has arisen for a maintenance engineer who is looking to move in to a shift pattern containing no nights and no weekends. You will be … more

    Apply Now
  47. Maintenance Engineer

    Posted 4 days ago by Stirling Warrington

    Salary:
    £37,000 - £45,000/annum
    Location:
    Preston, Lancashire, North West (18 miles)
    Job Type:
    Permanent

    Maintenance Engineer - Electrical Bias. Preston, Lancashire. £38,000. 8:30-4:30 Mon-Thu 8:30-1:30 Fri. Benefits. Free on-site parking. Average earnings of £45,000. Great healthcare system. Overtime opportunities (1.5x Mon-sat 2x Sun. Day shifts with an early finish on Friday, no … more

    Apply Now
  48. Maintenance Engineer

    Posted 2 days ago by Jenrick Engineering

    Salary:
    £50,000 - £59,500/annum
    Location:
    Huddersfield, West Yorkshire (20 miles)
    Job Type:
    Permanent

    Maintenance Engineer Huddersfield, UK. An exciting opportunity has arisen for a Maintenance Engineer to join our manufacturing team in Huddersfield. As Maintenance Engineer, you will carry out preventative and reactive maintenance on … more

    Apply Now
  49. Maintenance Engineer

    Posted 2 days ago by Detail 2 Recruitment Limited

    Salary:
    £45,000 - £46,200/annum
    Location:
    Blackpool (31 miles)
    Job Type:
    Permanent

    Maintenance Engineer - Manufacturing & Engineering - Blackpool - Up to £52,000. About the company. Due to expansion, our client is looking for multiple maintenance engineers to work as part of the engineering FMCG manufacturing team to provide … more

    Apply Now
  50. Maintenance Engineer

    Posted a week ago by Major Recruitment Huddersfield

    Salary:
    £28,500 - £35,000/annum
    Location:
    Huddersfield, West Yorkshire (20 miles)
    Job Type:
    Permanent

    Major Recruitment are currently seeking a Maintenance Engineer for our client based in the Huddersfield area. The ideal applicant should be apprentice trained, with good all-round skills, i.e. fitting, turning, milling and welding. They should have a minimum of five years' … more

    Apply Now

Register & Quick Apply

Passwords must contain at least six characters

As part of the CV-Library network, your CV will be uploaded to CV-Library's database, allowing you to be searched by thousands of potential recruiters and employers. By registering with Engineering Jobs you agree to our Privacy Policy and Terms & Conditions