Abstract
Detection of nitrogen fluorescence at 400 eV has been inefficient with proportional counters using polymer windows due to the low transmission of photons at this energy by carbon based compounds. Typically, two polypropylene films in a differentially pumped arrangement are used. We have chosen a single 230 nm silicon nitride (Si3N4) film as a window for a parallel plate avalanche counter. The Si3N4 window provides efficient N fluorescence detection while effectively filtering lower energy fluorescence. It can withstand atmospheric pressure and has extremely low gas leakage. It is therefore possible to operate the detector within a wide pressure range, even in an ultrahigh vacuum (UHV) environment. The detector has been constructed and its energy resolution is currently being tested. Results to date as well as future goals and applications will be discussed.
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