Coincidence measurements have been performed of double photoionization in atomic Ca in the region of the Ca 3p-3d resonance. The two electrons have been detected with equal and unequal energies and coincidences observed over a range of angles between the two electrons from approximately 90 • -270 • . Two pairs of lobes are observed in comparison with the single pair of lobes observed in the TDCS for He. Comparisons are made with the theoretical data of Ceraulo et al.
By using synchrotron radiation to excite calcium atoms in the 3p-3d resonance region, excited calcium ions are generated. In the first measurement of this kind, we have measured the polarization of the fluorescent photons which result from the decay of these ions, in coincidence with the corresponding angle-resolved photoejected electrons. By combining this with the angular distribution parameter for these same electrons, measured in a separate experiment, we are able to calculate for this specific case, within the assumption of LS coupling, the ratio of the dipole amplitudes for the outgoing waves and their phase difference.
A study of the photoionization of atomic calcium in the region of the 3p 5 3d4s 2 1 P 1 resonance at 31.41 eV is described. Measurements are made of the photoelectron angular distributions and branching ratios, corresponding to the case where the Ca + ion is left in excited Rydberg levels converging to the ground level of the doubly charged ion. The data are used to examine the validity of LS coupling and the spectator model of resonant Auger decay.
The triple differential cross section (TDCS) for double photoionization of calcium atoms has been studied, in the region of the Ca 3p3d giant resonance, for equal and unequal energy sharing by the two electrons. The measurements were performed at two different photon energies corresponding to different resonance symmetries, and the results show that the TDCS is strongly resonance dependent. For a fixed total energy the TDCS, at a relative angle of 180° for the two electrons, has been found to increase approximately linearly with increasing energy of one of the electrons.
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