The simultaneous photoionization and excitation of Ca and Sr atoms from the ground state into the first excited ionic P state has been investigated by measuring the intensity and the polarization of the emitted fluorescence radiation at 3933 AA and 4078 AA respectively. Cross sections for the direct excitation of the Ca + (4 2 P) and Sr + (5 2 P) states were found to be extremely small ((10 -19 cm 2 at threshold). However, these states can also be populated by resonant photoexcitation of atomic inner-shell states in the region of the Ca(3p 6 4s 2 -3p 5 3d4s 2 ) transition at 394.8 AA and the Sr(4p 6 5s 2 -4p 5 4d5s 2 ) transition at 490.9 AA, followed by autoionization processes. The ionic fluorescence in the respective resonance regions of Ca and Sr has been measured and compared with the corresponding photoelectron and photoion spectra.
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Hamdy et al. (1991) studied this question.
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