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We have employed the R matrix method to calculate differential cross sections for photoionization of helium leaving helium ion in an excited state for incident photon energy between the N=2 and N=3 thresholds (69～73 eV) of He + ion. Differential cross sections for photoionization in the N=2 level at emission angle 0° are provide. Our results are in good agreement with available experimental data and theoretical calculations.
We have employed the R matrix method to calculate differential cross sections for photoionization of helium leaving helium ion in an excited state for incident photon energy between the N = 2 and N = 3 thresholds (69-73 eV) of He + ion. Differential cross sections for photoionization in the N = 2 level at emission angle 0 ° are provide. Our results are in good agreement with available experimental data and theoretical calculations.