Probing doubly excited ionic states of N{sub 2}{sup +} via a triple excitation above the N 1s threshold in the N{sub 2} molecule
- Department of Physics, Uppsala University, Box 530, SE-751 21 Uppsala (Sweden)
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577 (Japan)
- Department of Chemistry, Hiroshima University, Higashi-Hiroshima 739-8526 (Japan)
- Department of Physics, Sophia University, Tokyo 102-8554 (Japan)
- Department of Synchrotron Radiation Research, Institute of Physics, University of Lund, Box 118, SE-221 00 Lund (Sweden)
Angle-resolved resonant Auger-electron spectroscopy has been carried out on the nitrogen molecule at selected photon energies around 419 eV, where a 1s core electron and two valence electrons are promoted into the lowest unoccupied molecular orbital 1{pi}{sub g}. Significant enhancement of a specific band, which cannot be disentangled in direct photoionization, is observed at a binding energy of 37.6 eV, with a value of the anisotropy parameter {beta} much smaller than 2. We assign this new band to the transition to a doubly excited cationic state of N{sub 2}, in which two of the excited valence electrons remain in the 1{pi}{sub g} orbital, proposing a 'double spectator' type decay mechanism. This observation shows how to preferentially probe multiply excited configurations of cations using multiple resonant excitation.
- OSTI ID:
- 20633833
- Journal Information:
- Physical Review. A, Journal Name: Physical Review. A Journal Issue: 3 Vol. 67; ISSN 1050-2947; ISSN PLRAAN
- Country of Publication:
- United States
- Language:
- English
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