Quenching and restoring of the A {sup 2}{pi} cationic state in resonant Auger electron spectra of CO in the vicinity of the O 1s{yields}2{pi} resonance
- Department of Physics, Uppsala University, Box 530, SE-751 21 Uppsala (Sweden)
- Department of Physics, Sophia University, Tokyo 102-8554 (Japan)
- Japan Synchrotron Radiation Research Institute, Sayo-gun, Hyogo 679-5198 (Japan)
- Area of Research, IPCF-CNR, via Moruzzi 1, 56124, Pisa (Italy)
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577 (Japan)
The evolution of the vibrational intensity distribution of the singly ionized A {sup 2}{pi} state in CO is experimentally examined for photon energy detunings below the adiabatic 0-0 transition of the O 1s{yields}2{pi} resonance. We have found a strong suppression of the entire vibrational fine structure of this state, leading to its almost complete quenching for certain excitation energies, followed by a partial restoring for larger values of negative photon energy detuning. Our observation, that cannot be rationalized by the known model of a vibrational collapse for energy detuning, may be explained in terms of a Fano interference between the direct and resonant photoionization channels in the presence of strong lifetime vibrational interference.
- OSTI ID:
- 20976488
- Journal Information:
- Physical Review. A, Vol. 74, Issue 6; Other Information: DOI: 10.1103/PhysRevA.74.062717; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1050-2947
- Country of Publication:
- United States
- Language:
- English
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