Rotationally resolved photoelectron spectra in resonance enhanced multiphoton ionization of HCl via the F sup 1. Delta. sub 2 Rydberg state

Journal Article · Sun Dec 15 04:00:00 EST 1991 · Journal of Chemical Physics; (United States)

DOI:https://doi.org/10.1063/1.461256· OSTI ID:6134209

Wang, K; McKoy, V ^[1]

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

Results of studies of rotational ion distributions in the {ital X} {sup 2}{Pi}{sub 3/2} and {ital X} {sup 2}{Pi}{sub 1/2} spin-orbit states of HCl{sup +} resulting from (2+1{prime}) resonance enhanced multiphoton ionization (REMPI) via the {ital S}(0) branch of the {ital F} {sup 1}{Delta}{sub 2} Rydberg state are reported and compared with measured threshold-field-ionization zero-kinetic-energy spectra reported recently (K. S. Haber, Y. Jiang, G. Bryant, H. Lefebvre-Brion, and E. R. Grant, Phys. Rev. A (in press)). These results show comparable intensities for {ital J}{sup +}=3/2 of the {ital X} {sup 2}{Pi}{sub 3/2} ion and {ital J}{sup +}=1/2 of the {ital X} {sup 2}{Pi}{sub 1/2} ion. Both transitions require an angular momentum change of {Delta}{ital N}={minus}1 upon photoionization. To provide further insight into the near-threshold dynamics of this process, we also show rotationally resolved photoelectron angular distributions, alignment of the ion rotational levels, and rotational distributions for the parity components of the ion rotational levels. About 18% population is predicted to occur in the (+) parity component, which would arise from odd partial-wave contributions to the photoelectron matrix element. This behavior is similar to that in (2+1) REMPI via the {ital S}(2) branch of the {ital F} {sup 1}{Delta}{sub 2} state of HBr and was shown to arise from significant {ital l} mixing in the electronic continuum due to the nonspherical molecular ion potential. Rotational ion distributions resulting from (2+1) REMPI via the {ital S}(10) branch of the {ital F} {sup 1}{Delta}{sub 2} state are also shown.

• OSTI ID: 6134209
• Journal Information: Journal of Chemical Physics; (United States), Journal Name: Journal of Chemical Physics; (United States) Vol. 95:12; ISSN JCPSA; ISSN 0021-9606
• Country of Publication: United States
• Language: English

Related Subjects

664200* -- Spectra of Atoms & Molecules & their Interactions with Photons-- (1992-)
74 ATOMIC AND MOLECULAR PHYSICS
AUGMENTATION
CHARGED PARTICLES
CHLORINE COMPOUNDS
COUPLING
DISTRIBUTION
ELECTRON SPECTROSCOPY
ENERGY
ENERGY LEVELS
EXCITED STATES
HALOGEN COMPOUNDS
HYDROCHLORIC ACID
HYDROGEN COMPOUNDS
INORGANIC ACIDS
INTERMEDIATE COUPLING
IONIZATION
IONS
L-S COUPLING
MOLECULAR IONS
MULTI-PHOTON PROCESSES
PARITY
PARTICLE PROPERTIES
PHOTOELECTRON SPECTROSCOPY
PHOTOIONIZATION
RESOLUTION
RESONANCE
ROTATIONAL STATES
RYDBERG STATES
SPECTROSCOPY
THRESHOLD ENERGY