The quasi‐open‐source mass spectrometer carried on the Atmosphere Explorer‐C satellite has a mode of operation which utilizes the velocity of the vehicle (∼ 8.5 km/sec near perigee) to distinguish between incoming ambient particles and ambient particles which have struck instrument surfaces and become accommodated. Utilization of this mode has made possible the simultaneous measurement of atomic and molecular ambient oxygen without the ambiguity which usually arises due to surface reactions in the instrument. The method appears promising as a means for analyzing planetary atmospheres or the gas surrounding comets.
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Nier et al. (1974) studied this question.
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