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Homework Help: Residual Gas in High Vacuum Systems

  1. Dec 28, 2012 #1
    1. The problem statement, all variables and given/known data

    What is the likely main residual gas constituent of a high vacuum system (HV) (P~1x10-4 Pa) and where does it come from? Explain how the vacuum may be improved to give ultra-high vacuum (UHV) (P~1x10-8 Pa). What is the likely main residual gas constituent of ultra-high

    3. The attempt at a solution

    My first guess was hydrocarbons for HV, but apparently that's something that occurs in rotary (rough) pumps which goes to about 10^-1 Pa.

    I've searching google with no answer to this particular question.

    Would anyone like to share their thoughts or a link with some answers?

    Thanks a lot.
  2. jcsd
  3. Dec 29, 2012 #2


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