Vibrationally resolved O 1s core-excitation spectra of CO and NO
- Institut fuer Experimentalphysik, Freie Universitaet Berlin, Arnimallee 14, D-14195 Berlin-Dahlem (Germany)
- Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720 (United States)
- Department of Physics, Wesleyan University, Middletown, Connecticut 06459 (United States)
- Instituto de Fisica, Apartado Postal 139-B, Cuernavaca 62191 (Mexico)
- Lehrstuhl fuer Theoretische Chemie, Ruhr-Universitaet Bochum, D-44780 Bochum (Germany)
High-resolution photoabsorption spectra of CO and NO below the O 1s ionization threshold are presented. The vibrational fine structure of the O 1s{r_arrow}{pi}{sup {asterisk}} and O 1s{sup {minus}1} Rydberg excitations could be resolved for both molecules, allowing a determination of the vibrational energies and intramolecular distances of the core-excitation states in CO and NO from Franck-Condon analyses. {ital Ab initio} calculations are performed for the O 1s{r_arrow}{pi}{sup {asterisk}} excitation in CO to give an independent confirmation of the spectroscopic parameters derived from the Franck-Condon analysis. The spectral features of the O 1s{sup {minus}1} Rydberg region in CO are reassigned on the basis of the experimental results. The results obtained for the O 1s{sup {minus}1}3s Rydberg state in NO support the idea of a weakening of the molecular bond upon an O 1s{sup {minus}1} ionization process. thinsp thinsp {copyright} {ital 1999} {ital The American Physical Society}
- OSTI ID:
- 337525
- Journal Information:
- Physical Review A, Journal Name: Physical Review A Journal Issue: 5 Vol. 59; ISSN 1050-2947; ISSN PLRAAN
- Country of Publication:
- United States
- Language:
- English
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