ANGLE-RESOLVED AND SPIN-RESOLVED PHOTOELECTRON-SPECTROSCOPY IN ROTATIONALLY RESOLVED PHOTOIONIZATION OF HI

The method of angle- and spin-resolved photoelectron spectroscopy has been used in combination with a laser based source of vacuum ultraviol et (VUV) radiation to study the photoionization dynamics of the HI mol ecule. The narrow bandwidth (DELTAnu < 1 cm-1) of the ionizing VUV rad iation (nu = 83200 cm-1 - 89300 cm-1) enables the resolution of the mo lecular rotation for single-photon excitation to spin-orbit autoioniza tion resonances. The experimental results for the dynamical parameters sigma, A, beta, xi, and alpha are compared to the results of a recent ab-initio calculation (M. Buchner, G. Raseev, and N.A. Cherepkov, J. Chem. Phys. 96, 2696 (1992)) and used to analyze the photoionization p rocess in terms of partial contributions of different values of l and lambda to the outgoing electron waves.