Differential operators on Lie groups

Abstract

than 100 ptorr. The low pressure limit, set by photon pressure in radiometer effect gauges, has been extended by the utilization of stmular reflection from the gauge surfaces. An expression has been derived for the deflwtion in absolute terms, and over a pressure range 0 . 4 p,torr to MS Abstract A wide range radiometer effect pressure gauge has been devised which gives a linear deflection with pressure over a theoretical range from 0.1 mtorr to less 0.1 mtorr an ion gauge has been found to give good agreement with the calculated pressure.