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Phys. Rev. A 74, 042508 (2006) [9 pages]

Franck-Condon transitions in a system with large-amplitude anharmonic vibrations coupled to a harmonic-oscillator bath: Application to the C 1s photoelectron spectrum of ethanol

M. Abu-samha and K. J. Børve
Department of Chemistry, University of Bergen, NO-5007 Bergen, Norway
Received 17 July 2006; published 13 October 2006

A vibrational adiabatic approach to Franck-Condon analysis is presented for systems with a few highly displaced oscillators coupled to a bath of harmonic oscillators. The model reduces the many-coupled-oscillator problem to few-body problems, albeit with corrections due to coupling to harmonic modes. The theory is applied with very good results to the carbon 1s photoelectron spectrum of ethanol, which is strongly influenced by change in conformation from gauche to anti when ethanol is ionized at the methyl site.

©2006 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevA.74.042508
DOI: 10.1103/PhysRevA.74.042508
PACS: 33.70.Ca; 33.20.Tp; 33.60.Fy; 33.70.Jg
  • 33.70.Ca
    Molecular oscillator and band strengths, lifetimes, transition moments, and Franck–Condon factors
  • 33.20.Tp
    Vibrational analysis (molecular spectra)
  • 33.60.Fy
    X-ray photoelectron spectra of molecules
  • 33.70.Jg
    Molecular line and band widths, shapes, and shifts
  • YEAR: 2006
KEYWORDS: organic compounds, Franck-Condon factors, vibrational states, photoelectron spectra, molecular configurations

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