1997
DOI: 10.1103/physreva.55.4221
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Ultrashort-lived non-Rydberg doubly excited resonances in diatomic molecules

Abstract: The CO ϩ emission systems A-X and B-X have been studied using monochromatic photon excitation in the range 20-34 eV. The vibrational branching ratios (vЈϭ4,5)/(vЈϭ3,2) for the A-X system were found to remain essentially constant within this excitation range, while the (vЈϭ1,2)/(vЈϭ0) branching ratios for the B-X system show a 40% variation. These results are interpreted using quasidegenerate many-body perturbation theory in terms of non-Rydberg doubly excited resonances in CO, which rapidly autoionize to vario… Show more

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Cited by 13 publications
(6 citation statements)
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“…Originally, the breakdown of the Franck-Condon approximation observed in the branching ratio spectra was explained by shape resonances or autoionization from singly excited Rydberg states. Recently, autoionizations from the non-Rydberg doubly excited states (NRDER:s) were detected in the branching ratio spectra of the N 2 and CO molecules [2,3], showing that also excitations to valence states should be considered in the analysis of the experimental data.…”
Section: Introductionmentioning
confidence: 99%
“…Originally, the breakdown of the Franck-Condon approximation observed in the branching ratio spectra was explained by shape resonances or autoionization from singly excited Rydberg states. Recently, autoionizations from the non-Rydberg doubly excited states (NRDER:s) were detected in the branching ratio spectra of the N 2 and CO molecules [2,3], showing that also excitations to valence states should be considered in the analysis of the experimental data.…”
Section: Introductionmentioning
confidence: 99%
“…If we now consider actual electron configuration double excitations (not involving fine structure), a number of examples reported so far were concerned with quite large double excitation energies and the coupling used for spectroscopic purposes involved an autoionization channel. For instance, doubly excited states of molecules H 2 , N 2 and CO show up as resonances in their photoionization spectra [4,5,6]. In the context of ultracold collisions, doubly excited states of the Na 2 molecule link the association reaction between two Na(3p 2 P) atoms to the associative ionization forming Na + 2 [7,8].…”
Section: Introductionmentioning
confidence: 99%
“…The N 2 curves show strong deviations from Franck-Condon behavior over a broad range at high energies while the CO results do not. In contrast, the CO results show strong deviations at lower energy, 22,23 while the N 2 curves are relatively flat in this region.…”
Section: Resultsmentioning
confidence: 54%
“…The current investigation addresses this issue by determining CO ϩ (B 2 ⌺ ϩ )v ϩ ϭ1/v ϩ ϭ0 vibrational branching ratios over a wide energy range for comparison with those of N 2 ϩ (B 2 ⌺ u ϩ ). While there has been enormous effort expended in understanding the VUV spectroscopy and photoionization dynamics of CO, [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23] none has dealt with vibrationally resolved measurements over a wide range of energy ͑i.e., Ͼ100 eV͒. Previous work, 1,2,4,6 in conjunction with results from the current study, demonstrate that molecular aspects of the ionization dynamics emerge far from threshold.…”
Section: Introductionmentioning
confidence: 99%