Article (Scientific journals)
Complex structures in the calculated photoionization spectrum of CO in the 17-17.5 eV energy region.
Leyh, Bernard; Raseev, Gheorghe
1988In Journal of Chemical Physics, 89 (2), p. 820-829
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Keywords :
Electronic autoionization; Vibrationally resolved photoionization cross sections,; High-n Rydberg states; Interaction between Rydberg states; Interaction between Rydberg series; MQDT
Abstract :
[en] Complicated spectral features appear in the CO photoionization spectra between 17 and 17.5 eV photon energy. In order to interpret these processes, we refine in the present paper our previous model [B. Leyh and G. Raseev, Phys.Rev. A34, 2920 (1986)] by introducing all the vibrational levels of the first three electronic states of CO+. This more accurate treatment leads to two major results. The resonance at 17.1 eV and 17.3 eV are complex resonances resulting from the interaction between the Rydberg series converging to the A2Pi and B2Sigma+ ionic states: they can no more be assigned simply to Rydberg states converging to CO+ B2Sigma+. The intermediate experimental feature at 17.2 eV, missing in our previous calculation, is now present in the theoretical spectrum. Mainly, this feature, which we have called composite resonance, is a broadned (by the experimental resolution) superposition of Rydberg states converging to the A2Pi,v+=4 state. In this paper, we present and analyze the vibrationally resolved cross sections and symmetry parameter for the X2Sigma+,v+=0-3 and A2Pi,v+0-4 states. These theoretical results are compared to recent experimental data by Leyh et al. [Chem.Phys.115, 243 (1987)] and by Hardis and co-workers (the preceeding paper).
Research center :
Laboratoire de Dynamique Moléculaire
Disciplines :
Chemistry
Author, co-author :
Leyh, Bernard  ;  Université de Liège - ULiège > Département de chimie (sciences) > Laboratoire de dynamique moléculaire
Raseev, Gheorghe
Language :
English
Title :
Complex structures in the calculated photoionization spectrum of CO in the 17-17.5 eV energy region.
Alternative titles :
[fr] Structure complexe dans le spectre de photoionization calculé de CO dans la domaine d'énergie de 17-17.5 eV.
Publication date :
1988
Journal title :
Journal of Chemical Physics
ISSN :
0021-9606
eISSN :
1089-7690
Publisher :
American Institute of Physics, New York, United States
Volume :
89
Issue :
2
Pages :
820-829
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
Fonds de la Recherche Scientifique (Communauté française de Belgique) - FNRS, FRFC, NATO (Contract n°096/82)
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