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All STIrACT Production of singly and doubly charted helium ions by Impact of keV photo,s ts studied. The ratio Rp0, -o+h+/a+h for photoabsorption Is calculated In the photon. en,_rsy ranse 2-18 keY ,sing correlated lnltla!, and lAnai.state wave functions. Extrap. elation towards asymptotic photon _.nergleuyields Rj,h(w--oo) = 1.60% !n agreement with previous predictions, ionization due to Compton scattering, which becomes com. parable to photoabsorption above w ", 3 keV, is discussed.doi:10.1063/1.45252 fatcat:ej5vt6364je45ih7sdxv4ikaxu