Rotationally resolved photoelectron spectra in resonance enhanced multiphoton ionization of SiF

Journal Article · Thu Oct 15 04:00:00 EDT 1992 · Journal of Chemical Physics; (United States)

DOI:https://doi.org/10.1063/1.463782· OSTI ID:7261431

Wang, K; McKoy, V ^[1]

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1. Arthur Amos Noyes Laboratory of Chemical Physics, California Institute of Technology, Pasadena, California 91125 (United States)

Results of calculations of rotationally resolved photoelectron spectra for resonance enhanced multiphoton ionization (REMPI) of SiF via the {ital B} {sup 2}{Sigma}{sup +} (4{ital s}{sigma}), {ital C}{double prime} {sup 2}{Sigma}{sup +} (4{ital p}{sigma}), and {ital C}{prime} {sup 2}{Pi} (4{ital p}{pi}) Rydberg states are reported. In addition to the expected {Delta}{ital N}=even peaks, unusually strong {Delta}{ital N}={plus minus}1 transitions are predicted for photoionization of the {ital B} {sup 2}{Sigma}{sup +} state. These unusual transitions are due to even angular momentum components of the photoelectron matrix element and arise from the formation of Cooper minima in the ionization channels and strong {ital l} mixing in the electronic continuum induced by the nonspherical molecular ion potential. Unexpected {Delta}{ital N}=0,{plus minus}2 transitions, due to odd wave contributions to the photoelectron matrix element, are also predicted for photoionization of the {ital C}{double prime} {sup 2}{Sigma}{sup +} state. Asymmetrical ion distributions with respect to {Delta}{ital N}=0 are also predicted for the {ital C}{prime} {sup 2}{Pi} state. Cooper minima are predicted to occur in the {ital l}=2 wave of the {ital k}{pi} photoelectron channel for the {ital B} state and in the {ital l}=4 wave of the {ital k}{sigma} and {ital k}{pi} channels for the {ital C}{double prime} state. Photoelectron angular distributions provide further insight into the photoionization dynamics.

• OSTI ID: 7261431
• Journal Information: Journal of Chemical Physics; (United States), Journal Name: Journal of Chemical Physics; (United States) Vol. 97:8; ISSN JCPSA; ISSN 0021-9606
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360604 -- Materials-- Corrosion
Erosion
& Degradation
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
664200* -- Spectra of Atoms & Molecules & their Interactions with Photons-- (1992-)
74 ATOMIC AND MOLECULAR PHYSICS
ASYMMETRY
CHARGED PARTICLES
CHEMICAL REACTIONS
DISTRIBUTION
ELECTRON SPECTROSCOPY
ELEMENTS
ENERGY LEVELS
ETCHING
EXCITED STATES
FLUIDS
FLUORIDES
FLUORINATION
FLUORINE COMPOUNDS
GASES
HALIDES
HALOGEN COMPOUNDS
HALOGENATION
IONS
MATRIX ELEMENTS
MULTI-PHOTON PROCESSES
PHOTOELECTRON SPECTROSCOPY
RADICALS
RESOLUTION
RESONANCE
ROTATIONAL STATES
RYDBERG STATES
SEMIMETALS
SILICON
SILICON COMPOUNDS
SILICON FLUORIDES
SILICON HALIDES
SPECTROSCOPY
SURFACE FINISHING