| Full text | |
| Author(s): |
Lebech, M.
[1, 2, 3]
;
Houver, J. C.
[2, 3]
;
Raseev, G.
[2, 3]
;
dos Santos, A. S.
[4]
;
Dowek, D.
[2, 3]
;
Lucchese, Robert R.
[5]
Total Authors: 6
|
| Affiliation: | [1] Niels Bohr Inst, DK-2100 Copenhagen - Denmark
[2] Univ Paris 11, Inst Sci Mol Orsay, F-91405 Orsay - France
[3] Univ Paris 11, CNRS, F-91405 Orsay - France
[4] Univ Fed Sao Carlos, Dept Fis, BR-13565905 Sao Carlos, SP - Brazil
[5] Texas A&M Univ, Dept Chem, College Stn, TX 77843 - USA
Total Affiliations: 5
|
| Document type: | Journal article |
| Source: | Journal of Chemical Physics; v. 136, n. 9 MAR 7 2012. |
| Web of Science Citations: | 10 |
| Abstract | |
Experimental and theoretical results for molecular-frame photoemission are presented for inner-valence shell photoionization of the CO molecule induced by linearly and circularly polarized light. The experimental recoil frame photoelectron angular distributions (RFPADs) obtained from dissociative photoionization measurements where the velocities of the ionic fragment and photoelectron were detected in coincidence, are compared to RFPADs computed using the multichannel Schwinger configuration interaction method. The formalism for including a finite lifetime of the predissociative ion state is presented for the case of general elliptically polarized light, to obtain the RFPAD rather than the molecular frame photoelectron angular distribution (MFPAD), which would be obtained with the assumption of instantaneous dissociation. We have considered photoionization of CO for the photon energies of 26.0 eV, 29.5 eV, and 32.5 eV. A comparison of experimental and theoretical RFPADs allows us to identify the ionic states detected in the experimental studies. In addition to previously identified states, we found evidence for the 2 (2)Delta state with an ionization potential of 25.3 eV and (2)Sigma(+) states with ionization potentials near 32.5 eV. A comparison of the experimental and theoretical RFPADs permits us to estimate predissociative lifetimes of 0.25-1 ps for some of the ion states. Consideration of the MFPADs of a series of (2)Pi ion states indicates the importance of inter-channel coupling at low photoelectron kinetic energy and the limitations of a single-channel analysis based on the corresponding Dyson orbitals. (C) 2012 American Institute of Physics. {[}http://dx.doi.org/10.1063/1.3681920] (AU) | |