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Proceedings Paper

Competition among autoionization, predissociation, and ion-pair formation in molecular hydrogen
Author(s): Joseph L. Dehmer; P. M. Dehmer; Stephan T. Pratt; Elizabeth F. McCormack
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Paper Abstract

We have investigated autoionization, predissociation, and ion-pair formation from highly excited states of molecular hydrogen by using double-resonance excitation via the E, F 1(Sigma) g+, v equals 6 level. The energetic threshold for ion-pair formation occurs just below the H2+ X 2(Sigma) g+, v+ equals 9 ionization threshold. The spectrum in this region was studied by using conventional and constant-ionic-state photoelectron spectroscopy, by monitoring the H- production, and by detecting dissociation products by ionization with a third laser. The decay dynamics in this region are extremely rich, because the excited levels may decay by rotational and vibrational autoionization, by predissociation to neutral H + H* (n equals 2, 3, 4), by predissociation to the ion pair H+ + H-, and by fluorescence. In addition, the dissociative potential curve of the 2p(sigma) u3s(sigma) g 1(Sigma) u+ doubly excited electronic state crosses the H2+ X 2(Sigma) g+ potential curve in the same energy region, and the electronic autoionization of this state is found to significantly influence these decay processes.

Paper Details

Date Published: 22 April 1993
PDF: 9 pages
Proc. SPIE 1858, Laser Techniques for State-Selected and State-to-State Chemistry, (22 April 1993); doi: 10.1117/12.143082
Show Author Affiliations
Joseph L. Dehmer, Argonne National Lab. (United States)
P. M. Dehmer, Argonne National Lab. (United States)
Stephan T. Pratt, Argonne National Lab. (United States)
Elizabeth F. McCormack, Argonne National Lab. (United States)


Published in SPIE Proceedings Vol. 1858:
Laser Techniques for State-Selected and State-to-State Chemistry
Cheuk Yiu Ng, Editor(s)

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