22 April 1993 Competition among autoionization, predissociation, and ion-pair formation in molecular hydrogen
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Proceedings Volume 1858, Laser Techniques for State-Selected and State-to-State Chemistry; (1993) https://doi.org/10.1117/12.143082
Event: OE/LASE'93: Optics, Electro-Optics, and Laser Applications in Scienceand Engineering, 1993, Los Angeles, CA, United States
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.
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Joseph L. Dehmer, Joseph L. Dehmer, P. M. Dehmer, P. M. Dehmer, Stephan T. Pratt, Stephan T. Pratt, Elizabeth F. McCormack, Elizabeth F. McCormack, } "Competition among autoionization, predissociation, and ion-pair formation in molecular hydrogen", Proc. SPIE 1858, Laser Techniques for State-Selected and State-to-State Chemistry, (22 April 1993); doi: 10.1117/12.143082; https://doi.org/10.1117/12.143082
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