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Degradation of the Lunar Vacuum by a Moon Base - G. A. Landis (1990) (3404 words) |
 | The ambient pressure is in the range of 5.E4 [1] to 2.E5 [2-4] molecules/cm3 during the lunar night, and 6.1 E5 to <1 E7 molecules/cm3 during the lunar day [5]. |
| It is believed that impurities in the deposited films of concentration greater than 1 E18/cm3 cause (or exacerbate) the deleterious light-induced degradation effect; this corresponds to a base pressure of 2000 nanotorr at deposition pressure 1 torr; 100 nanotorr at deposition pressure 0.05 torr. |
| This ranges from 1 E-5 torr for the magnetron tubes used in microwave ovens, to ultra-high vacuum of 1 E-10 torr for travelling-wave tubes. |
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