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Vibrationally resolved threshold photoemission of N2 and CO at the N and C K-edges

✍ Scribed by L.J. Medhurst; P.A. Heimann; M.R.F. Siggel; D.A. Shirley; C.T. Chen; Y. Ma; S. Modesti; F. Sette

Publisher: Elsevier Science
Year: 1992
Tongue: English
Weight: 493 KB
Volume: 193
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(92)85838-2

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✦ Synopsis

Zero-kinetic-energy photoelectron spectroscopy was used to measure the Franck-Condon factors for the carbon and nitrogen K-shell ionized states in Nz and CO. Corresponding features in the two spectra showed nearly identical energy spacings, both below and above the ionization threshold, as predicted by the equivalent-core model. The equilibrium bond length, R,, for the CO C-ls-i state was determined to be 1.077 + 0.005 A, and R, for the N2 N-ls-' state was found to be 1.077 ?r 0.010 A, changes of -0.05 1 A for CO and -0.020 A for Nz from their ground-state equilibrium bond lengths. The two-electron states corresponding to 1 s-' val-ix* were examined in the binding energy region predicted by Green function calculations. Two-electron states absent in the X-ray photoemission spectrum are present in both molecules and show evidence of vibrational structure.

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