SINGLE AND DOUBLE-IONIZATION OF HELIUM BY HIGH-ENERGY PHOTON IMPACT

[摘要] Production of singly and doubly charged helium ions by impact of keV photons is studied. The ratio R(ph) = sigma(ph)++/sigma(ph)+ for photoabsorption is calculated in the photon-energy range 2-18 keV using correlated initial- and final-state wave functions. Extrapolation towards asymptotic photon energies yields R(ph)(omega --> infinity) = 1.66% in agreement with previous predictions. Ionization due to Compton scattering, which becomes comparable to photoabsorption above omega approximately 3 keV, is discussed.

[发布日期] 1994-04-01

[效力级别]  Proceedings Paper