Abstract
The total photoionization cross section of transitions from the ground state (Xe)6s2 of neutral barium atoms to 5dnp, 5dnf, 6pns, 7snp, 6dnp and 4fnd (J=1, odd parity) doubly excited autoionizing states in the energy range between 42000 cm-1 and 89000 cm-1 has been determined. The experiment used a linear thermionic diode detector and monochromatized synchrotron radiation from the DORIS II storage ring with a bandwidth of 0.3 AA. The diode detector allowed for a significant improvement of the signal-to-noise ratio over previous measurements and is described in some detail. The photoionization cross section of the 5d and 6p channels is compared with recent calculations. For the Rydberg series converging to the 7s1/2, 6d3/2 and 6d3/2 states of Ba+ a tentative assignment for the doubly excited states in terms of the independent particle model is proposed.
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