Measurement of cross sections and oscillator strengths for Xe by electron impact.

Abstract

Differential cross sections and generalized oscillator strengths have been measured for two optically allowed transitions 5{ital p}{sup 6}({sup 1}{ital S}{sub 0}){r arrow}5{ital p}{sup 5}({sup 2}{ital P}{sub 1/2})6{ital s} and 5{ital p}{sup 5}({sup 2}{ital P}{sub 3/2})6{ital s} in Xe by means of electron-energy-loss spectroscopy. These measurements are carried out for electron kinetic energies of 100, 400, and 500 eV at small scattering angles ({theta}=1.4{degree}--14.6{degree}). The generalized oscillator strengths are extrapolated to zero momentum transfer to get the optical oscillator strengths and they are compared with those obtained by optical methods and theoretical calculations. The optical oscillator strengths obtained by this work for the 5{ital p}{sup 5}({sup 2}{ital P}{sub 1/2})6{ital s} and 5{ital p}{sup 5}({sup 2}{ital P}{sub 3/2})6{ital s} states are 0.158{plus minus}0.019 and 0.222{plus minus}0.027, respectively. Integral cross sections have been also determined for each impact energy. The errors are estimated to be less than 12%.