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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 language | English |
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Article number | 052510 |
Journal | Physical Review A - Atomic, Molecular, and Optical Physics |
Volume | 71 |
Issue number | 5 |
DOIs | |
State | Published - 1 May 2005 |
ID: 43207342