Journal
JOURNAL OF CHEMICAL PHYSICS
Volume 120, Issue 16, Pages 7490-7496Publisher
AIP Publishing
DOI: 10.1063/1.1687675
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We present a multimode vibrational analysis of the gas-phase ultraviolet photoelectron spectra of the first ionization in anthracene, tetracene, and pentacene, using electron-vibration constants computed at the density functional theory level. The first ionization of each molecule exhibits a high-frequency vibronic structure; it is shown that this regularly spaced feature is actually the consequence of the collective action of several vibrational modes rather than the result of the interaction with a single mode. We interpret this feature in terms of the missing mode effect. We also discuss the vibronic coupling constants and relaxation energies obtained from the fit of the photoelectron spectra with the linear vibronic model. (C) 2004 American Institute of Physics.
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