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Spacecraft Self-Contamination by Molecular Outgassing
MASSACHUSETTS INST OF TECH LEXINGTON LINCOLN LAB
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The contamination of spacecraft surfaces from ambient and outgassing molecules is considered. A model is formulated for the molecules desorbed from the spacecraft surfaces and scattered by the ambient molecules back to the emitting and adjacent surfaces. Equations are derived for the backscatter and far-field cases as a function of surface geometry, mean free path, and desorbing beam shape. Expressions are given for point to point and flat surface to point scattering. The scattered molecular irradiance is combined with other sources to obtain the total molecular irradiance. A calculation of the contamination during launch of the Lincoln Experimental Satellites 8 and 9 is given.
APPROVED FOR PUBLIC RELEASE