Out-gassing rate for (N-m)/m2/s or Ji 133.32 species i W/m2 Source area Ai m2 cm2 10-4 Species molecular weight mi AMU - Sticking affinity i 0< i <1 - Molecular linear dimension ai m cm 10-2 Distance to mirror dm Mirror area Am m2 cm2 10-4 Mirror orientation - Pumping for species i Si m3/s liter/s 10-3 Partial pressure for Pi N/m2 or Pa torr 133.32 species i Rate of increase of optical ppm/yr losses with time Table 6: Physical Constants Physical Constants 1.38 10-16 Boltzmann constant k 1.38 10-23 J/K 10-7 erg/K Atomic Mass Unit 12C 1.66 10-24 standard: 12 AMU = 12 gm AMU 1.66 10-27 kg 10-3 gm / NA) Avogadro's Number NA 6.023 1023 - Ambient Temperature, T0 300 K - 27oC Figure 3 depicts schematically the geometrical arrangement of a source, mirror, and pump system.
Out-gassing rate for species i Ji (N-m)/m2/s or W/m2 133.32 Source area Ai m2 cm2 10-4 Species molecular weight mi AMU - Sticking affinity i 0< i <1 - Molecular linear dimension ai m cm 10-2 Distance to mirror dm Mirror area Am m2 cm2 10-4 Mirror orientation - Pumping for species i Si m3/s liter/s 10-3 Partial pressure for species i Pi N/m2 or Pa torr 133.32 Rate of increase of optical losses with time ppm/yr Table 6: Physical Constants Physical Constants Boltzmann constant k 1.38 10-23 J/K 1.38 10-16 erg/K 10-7 Atomic Mass Unit 12C standard: 12 AMU = 12 gm / NA) AMU 1.66 10-27 kg 1.66 10-24 gm 10-3 Avogadro's Number NA 6.023 1023 - Ambient Temperature, 27oC T0 300 K - Figure 3 depicts schematically the geometrical arrangement of a source, mirror, and pump system.