Rotational branching ratios and photoelectron angular distributions in resonance enhanced multiphoton ionization of HBr via the F sup 1. Delta. sub 2 Rydberg state

Journal Article · Sun Dec 01 04:00:00 EST 1991 · Journal of Chemical Physics; (United States)

DOI:https://doi.org/10.1063/1.461316· OSTI ID:5132062

Wang, K; McKoy, V ^[1]

---

1. Arthur Amos Noyes Laboratory of Chemical Physics, California Institute of Technology, Pasadena, California (USA)

Results of theoretical studies of rotational ion distributions in the {ital X} {sup 2}{Pi}{sub 1/2} ground state of HBr{sup +} resulting from (2+1) resonance enhanced multiphoton ionization (REMPI) via the {ital S}(2) branch of the {ital F} {sup 1}{Delta}{sub 2} Rydberg state are reported. These results show a strongly parity-favored ion distribution with about 80% population in the ({minus}) component of the {Lambda} doublet of {ital J}{sup +} rotational levels. The 20% population in the other parity component of the {Lambda} doublet can be seen to be due to odd partial wave contributions to the photoelectron matrix elements which arise primarily from non-atomic-like behavior of the electronic continuum. This, in turn, is due to angular momentum coupling in the photoelectron orbital brought about by the torques of the nonspherical molecular ion potential. We demonstrate that the effect of alignment on these ion distributions, although not large, is important. Photoelectron angular distributions and alignment of the {ital J} levels of the HBr{sup +} ions are also presented. Rotational branching ratios and photoelectron angular distributions resulting from (2+1{prime}) REMPI of HBr via several {ital S} branches of the {ital F} {sup 1}{Delta}{sub 2} state are also shown for near-threshold photoelectron energies.

• OSTI ID: 5132062
• Journal Information: Journal of Chemical Physics; (United States), Journal Name: Journal of Chemical Physics; (United States) Vol. 95:11; ISSN JCPSA; ISSN 0021-9606
• Country of Publication: United States
• Language: English

Related Subjects

640302* -- Atomic
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
74 ATOMIC AND MOLECULAR PHYSICS
ANGULAR DISTRIBUTION
BROMINE COMPOUNDS
CATIONS
CHARGED PARTICLES
DISTRIBUTION
ENERGY
ENERGY LEVELS
EXCITED STATES
GROUND STATES
HALOGEN COMPOUNDS
HYDROBROMIC ACID
HYDROGEN COMPOUNDS
INORGANIC ACIDS
IONIZATION
IONS
MOLECULAR IONS
MULTI-PHOTON PROCESSES
PARITY
PARTICLE PROPERTIES
PHOTOIONIZATION
POTENTIALS
RESONANCE
ROTATIONAL STATES
RYDBERG STATES
THRESHOLD ENERGY