The Electronic Structure of Tetraphosphorus-and Tetraarsenic- Trisulphides; Interpretation of their Photoelectron Spectra

Abstract
Ab initio SCF calculations of the X1A1 ground states of P4S3 and As4S3 are reported, together with configuration interaction studies of the 2 A1, 2 A1, 2 A2 and 2 E states of P4S3. A re-interpretation of the UV-photoelectron spectrum of the P4S3 molecule, and As4S3 by analogy, is presented and it is noted that Koopmans′ theorem yields a very similar order and spacing between groups to the doublet states computed by configuration interaction.

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