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Lunar mass spectrometer test programThe procedures are described along with results obtained in a test program conducted to demonstrate the performance of a candidate lunar mass spectrometer. The instrument was designed to sample and measure gases believed to exist in the lunar atmosphere at the surface. The subject instrument consists of a cold cathode ion source, a small quadrupole mass analyzer and an off axis electron multiplier ion counting detector. The major program emphasis was placed on demonstrating instrument resolution, sensitivity and S/N ratio over the mass range 0-150 amu and over a partial pressure range from 10 to the minus 9th power to 10 to the minus 13th power torr. Ultrahigh vacuum tests were conducted and the minimum detectable partial pressure for neon, argon, krypton and xenon was successfully determined for the spectrometer using isotopes of these gases. With the exception of neon, the minimum detectable partial pressure is approximately 4 x 10 to the minus 14th power torr for the above gases.
Document ID
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Torney, F. L.
(National Research Corp. Cambridge, MA, United States)
Dobrott, J. R.
(National Research Corp. Cambridge, MA, United States)
Date Acquired
September 2, 2013
Publication Date
January 1, 1972
Subject Category
Instrumentation And Photography
Report/Patent Number
Accession Number
Funding Number(s)
Distribution Limits
Work of the US Gov. Public Use Permitted.
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