Dissociative decay of high-v Rydberg states of molecular hydrogen
- Argonne National Laboratory, IL (United States)
Double resonance spectroscopy via the E,F {sup 1}{Sigma}{sub g}{sup +}, v = 6 state has been used to investigate the decay of (X {sup 2}{Sigma}{sub g}{sup +})np, v {ge} 9 Rydberg states of H{sub 2} into the H(1s) + H(3l) and H(1s) + H(4l) dissociation continua. The H(3l) and H(4l) dissociation products were detected by monitoring the energy-resolved photoelectrons produced by nonresonant ionization of the fragments. The energy region studied included the X {sup 2}{Sigma}{sub g}{sup +}, v{sup +} = 9, N{sup +} = 0-3 ionization thresholds; the H(1s) + H(4l) dissociation threshold; and the H{sup +} + H{sup -} ion-pair threshold. Evidence of direct and indirect processes involving both singly and doubly excited electronic states was observed. Comparisons with previously observed autoionization and ion-pair formation spectra reveal strong competition between the ionization and dissociation processes through both rovibrational and electronic interactions. Taken together, these results provide a unique set of experimental data on the decay of highly excited states of H{sub 2} into four separate final-state continua in a common energy region and are relevant to theoretical efforts to understand the competition between ionization and dissociation decay mechanisms.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 281198
- Report Number(s):
- CONF-9305421--
- Journal Information:
- Bulletin of the American Physical Society, Journal Name: Bulletin of the American Physical Society Journal Issue: 3 Vol. 38; ISSN 0003-0503; ISSN BAPSA6
- Country of Publication:
- United States
- Language:
- English
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