Dissociation dynamics of high-v Rydberg states of molecular hydrogen
- Argonne National Lab. (ANL), Argonne, IL (United States)
A high-resolution, state-selective investigation of the decay of (X ²Σ⁺g)np, v'≥9 Rydberg states of H2 into the H(1s)+H(3I) and H(1s)+H(4I) dissociation continua has been performed. The (X ²Σ⁺g)np Rydberg states were excited by double-resonance excitation via the E,F ¹Σg⁺, v=6, J=0 and 1 states, and the H(3I) and H(4I) dissociation products were detected by monitoring the energy-resolved photoelectrons produced by nonresonant photoionization of the fragments. The energy region of interest (138 800--140 000 cm⁻¹) includes the X ²Σ⁺g, v⁺=9, N⁺=0--3 ionization thresholds, the H(1s)+H(4I) dissociation threshold, and the H⁺+H⁻ ion-pair threshold. Evidence of both direct and indirect dissociation involving both singly and doubly excited electronic states is observed. Comparisons to the previously observed X ²Σ⁺g, v⁺=8 constant-ionic-state photoelectron spectrum and the ion-pair spectrum observed in the same energy region reveal strong competition between the ionization and dissociation processes through both rovibrational and electronic interactions.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE; Office of Energy Research (OER); Office of Health and Environmental Research (OHER)
- DOE Contract Number:
- W-31-109-ENG-38
- OSTI ID:
- 6585759
- Journal Information:
- Journal of Chemical Physics, Vol. 98, Issue 11; ISSN 0021-9606: JCPSA6
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
HYDROGEN
RYDBERG STATES
DISSOCIATION
DOUBLE RESONANCE METHODS
EXCITATION
PHOTOEMISSION
PHOTOIONIZATION
RESOLUTION
THRESHOLD ENERGY
VIBRATIONAL STATES
ELEMENTS
EMISSION
ENERGY
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EXCITED STATES
IONIZATION
NONMETALS
SECONDARY EMISSION
664200* - Spectra of Atoms & Molecules & their Interactions with Photons- (1992-)