Helium purge flow prevention of atmospheric contamination of cryogenically cooled optics on orbiting infrared telescopes |
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Authors: | N.M. Harvey R.R. Herm |
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Affiliation: | Chemistry and Physics Laboratory, The Aerospace Corporation. P.O. Box 92957 Los Angeles, CA 90009, U.S.A. |
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Abstract: | The ability of a He purge gas to protect the cryogenically cooled optics of orbiting infrared telescopes from the primary atmospheric contaminant, atomic oxygen, can be estimated by calculations simulating the He-O scattering events that would occur in the operating telescope. This paper reports results of accurate quantum mechanical calculations of the He-O differential cross sections σ(θ, E) needed in such calculations. To facilitate the use of these cross sections, a simple separable function of E and θ is also given which provides an adequate representation of σ(θ, E) for the entire range of relative collision energies studied, E = 0.02?1.66 eV. |
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