PHOTOIONIZATION OF THE 1ST-ROW AND 2ND-ROW ATOM HYDRIDES USING SYNCHROTRON RADIATION - BETA-MEASUREMENTS FOR THE OUTER-VALENCE AND INNER-VALENCE SHELLS

Experimental results on the valence shell photoionization of argon- and neon-like molecules are reviewed and unpublished results are included. The outer lone-pair orbitals of the hydride secondrow atoms are characterized by a chlorine, sulfur or phosphorus 3p atomic character revealed by the occurrence of a Cooper minimum in the β trend associated with the first valence band in the photoelectron spectra; this atomic behavior is discussed as a function of the hydrogen environment. By comparing the β trends for the main band in the complex inner-valence photoelectron spectra of the first- and second-row atom hydrides we point out a similar behavior which reveals the main "s" atomic character of the inner valence orbital. © 1990.