By Richard E. Wainerdi (Eds.)
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Extra info for Analytical Chemistry in Space
G. C8). To assess the role of such fields, measurements of the state of ionization of lunar gases are also important. "Scale heights" (altitudes at which the pressure of a particular atmospheric constituent has decreased to l Je of that at the planetary surface), depend on gravitational acceleration and atmospheric temperature as well as molecular weight. It is estimated that scale heights on the Moon range from thousands of kilometers for hydrogen to 15 km for xenon. The average "temperature" of the interacting particles of the lunar atmosphere (below scale height) should be approximately 400°K where exposed to sunlight.
A search for these molecules should be made both in the atmosphere and in individual craters. 11. Ion spectrum. Determination of the state of ionization of the lunar atmosphere is, of course, important to an understanding of ionization processes per se. However, to the extent they are present, ions will also introduce additional complexity into spectra obtained by a mass spectrometer. It is clear that most of the constituents of any model lunar atmosphere that has been proposed will be partially ionized by ultraviolet radiation from the Sun and by charge exchange with solar-wind ions.
If the actual total pressure is higher, or lower, these numbers will of course be shifted accordingly. The first Surveyor used approximately 1500 lbs of fuel (monomethyl h y d r a z i n e / N 2 0 4 ) 28 for de-boosting the spacecraft to a soft landing on the moon. Thus it released about 2 χ 1 0 particles into the lunar atmosphere. —include some of the constituents of the lunar atmosphere it is of most interest to study. 4 χ 1 0 more molecules to enable the vehicle to leave lunar orbit and enter Moon-Earth transfer.
Analytical Chemistry in Space by Richard E. Wainerdi (Eds.)