Effect of vibrations on C 1s photoemission in formaldehyde in the shape resonance region

A. De Fanis, D. A. Mistrov, M. Kitajima, M. Hoshino, H. Shindo, T. Tanaka, H. Tanaka, Y. Tamenori, A. A. Pavlychev, K. Ueda

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15 Citations (Scopus)


The vibrationally resolved C 1s single-hole ionization cross sections of H2CO are measured in the region of the σ* shape resonance. The energy of the shape resonance is pushed down by the excitation of the C-O stretching vibration v2′. Our calculations, which take account of elastic multiple scattering within the C-O potential box, show that the downward shift of the shape resonance energy is originated from the elongation of the characteristic internuclear C-O distance in the core-ionized molecule with an increase in v2′. The characteristic internuclear distance varies from R+(0,0,0)=1.198 up to R+(0,2,0)=1.415. In addition to the elastic multiple-scattering mechanism, the internal inelastic scattering of the C 1s photoelectron by valence electrons is suggested as a possible mechanism responsible for the enhancement of vibrational excitations through the shape resonance and near threshold.

Original languageEnglish
Article number052510
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Issue number5
Publication statusPublished - 2005 May
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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