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

Journal Article · Sun May 15 04:00:00 EDT 2005 · Physical Review. A

DOI:https://doi.org/10.1103/PhysRevA.71.052510· OSTI ID:20717753

De Fanis, A; Tamenori, Y ^[1]; Mistrov, D A ^[2]; Kitajima, M; Hoshino, M; Shindo, H; Tanaka, T; Tanaka, H ^[3]; Pavlychev, A A ^[2]; Ueda, K ^[4]

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1. Japan Synchrotron Radiation Research Institute, Sayo-gun, Hyogo 679-5198 (Japan)
2. Institute of Physics, St. Petersburg State University, 198504 St. Petersburg (Russian Federation)
3. Department of Physics, Sophia University, Tokyo 102-8544 (Japan)
4. Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577 (Japan)

The vibrationally resolved C 1s single-hole ionization cross sections of H{sub 2}CO are measured in the region of the {sigma}* shape resonance. The energy of the shape resonance is pushed down by the excitation of the C-O stretching vibration v{sub 2}{sup '}. 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 v{sub 2}{sup '}. The characteristic internuclear distance varies from R{sup +}(0,0,0)=1.198 A up to R{sup +}(0,2,0)=1.415 A. 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.

• OSTI ID: 20717753
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 5 Vol. 71; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
BOND LENGTHS
DISTANCE
ELECTRONS
EXCITATION
FORMALDEHYDE
HOLES
INELASTIC SCATTERING
MOLECULES
MULTIPLE SCATTERING
PHOTOEMISSION
PHOTOIONIZATION
POTENTIALS
RESONANCE
VALENCE
VIBRATIONAL STATES