What’s better? Vacuum optics or Argon?
Argon optics are superior to vacuum optics due to cost-efficiency, shorter stabilization time, and reduced risk to instruments. While vacuum optics were historically necessary for spectrometers to maintain an inert environment, advancements in CMOS/CCD technology allow for smaller chambers filled with Argon. This minimizes operating costs and eliminates risks like oil backflow from vacuum pumps. Therefore, Argon-filled optics are now preferred for modern Optical Emission Spectrometers (OES) due to their overall better performance and reliability.
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https://www.metalpower.net/oes/why_argon/
