Abstract
The Apollo 15 flight carried the first mass spectrometer to be flown beyond the earth's atmosphere. As part of the Lunar Orbital Science Experiments Package it was designed to measure the composition of the atmosphere of the moon. The instrument, a dual colletor, single-focusing sector-field spectrometer, was mounted on a 7.3 meter bi-stem boom extended from the service module and operated by a crew member fro the command module during the lunar orbit and trans-earth coast phases of the mission. Approximately 90 hours of data were obtained showing many mass peaks of significant magnitude in lunar orbit, but with much reduced amplitude during trans-lunar coast. Pre-flight absolute calibration was done at the Langley Research Center Molecular Beam Facility.
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