Cross section and spin polarization for photoionization of the HI molecule: Rotationally resolved theoretical results in the spin–orbit autoionization region

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Abstract
The theoretical calculations of rotationally resolved total and differential cross sections and spin polarization parameters for the photoionization of HI molecule are presented. These calculations are based on the theoretical expressions derived by Raşeev and Cherepkov [Phys. Rev. A 42, 3948 (1990)]. The transition moments used in the calculation are taken from an ab initio calculation without rotation. Molecular rotation is included in the framework of a simplified model taking into account Hund’s case (c)–(e) frame transformation. The results of ab initio calculations of cross section and electron spin polarization parameters for state-to-state transition are obtained for the first time. Averaged over the rotational levels of the initial state and summed over the rotational levels of the final state of the ion, these calculations are compared with the recent measurements of the total cross section and integrated spin polarization parameters performed in Bielefeld.