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Title: Nonadiabatic effects on the photodissociation of diatomic molecules to open-shell atoms. [CH/sup +/ + h nu. -->. C/sup +/(2/sup 2/P/sub 1/2, 3/2/) + H(1/sup 2/S)]

Abstract

Photodissociation of diatomic molecules to open-shell atoms is shown to be very strongly affected by nonadiabatic interactions when the photon energy is just above the threshold for dissociation. The energy dependences of photodissociation cross sections and various anisotropy parameters exhibit a wealth of structure in conformity with their theoretical predictions that nonadiabatic interactions between molecular states, approaching the same atomic term limit, lead to the emergence of resonance features in the spectra. Some of these features are associated with Feshbach and shape resonances on states that carry no oscillator strength in zeroth order. As an example, they consider the photodissociation cross sections for the production of individual C/sup +/(/sup 2/P/sub 3/2,1/2/) states from selected initial CH/sup +/ levels and the fragment angular distribution, orientation, and alignment. They discuss how totally oriented fragments can be produced by near-threshold photodissociation in a magnetic field.

Authors:
; ; ;
Publication Date:
Research Org.:
Ben Gurion Univ., Beer-Sheva, Israel
OSTI Identifier:
5940945
Resource Type:
Journal Article
Journal Name:
J. Phys. Chem.; (United States)
Additional Journal Information:
Journal Volume: 91:21
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; ALKYL RADICALS; DISSOCIATION; CARBON; POLARIZATION; HYDROGEN; ANGULAR DISTRIBUTION; CATIONS; MAGNETIC FIELDS; PHOTOCHEMISTRY; THEORETICAL DATA; CHARGED PARTICLES; CHEMISTRY; DATA; DISTRIBUTION; ELEMENTS; INFORMATION; IONS; NONMETALS; NUMERICAL DATA; RADICALS; 400500* - Photochemistry

Citation Formats

Band, Y B, Freed, K F, Singer, S J, and Williams, C J. Nonadiabatic effects on the photodissociation of diatomic molecules to open-shell atoms. [CH/sup +/ + h nu. -->. C/sup +/(2/sup 2/P/sub 1/2, 3/2/) + H(1/sup 2/S)]. United States: N. p., 1987. Web. doi:10.1021/j100305a005.
Band, Y B, Freed, K F, Singer, S J, & Williams, C J. Nonadiabatic effects on the photodissociation of diatomic molecules to open-shell atoms. [CH/sup +/ + h nu. -->. C/sup +/(2/sup 2/P/sub 1/2, 3/2/) + H(1/sup 2/S)]. United States. https://doi.org/10.1021/j100305a005
Band, Y B, Freed, K F, Singer, S J, and Williams, C J. 1987. "Nonadiabatic effects on the photodissociation of diatomic molecules to open-shell atoms. [CH/sup +/ + h nu. -->. C/sup +/(2/sup 2/P/sub 1/2, 3/2/) + H(1/sup 2/S)]". United States. https://doi.org/10.1021/j100305a005.
@article{osti_5940945,
title = {Nonadiabatic effects on the photodissociation of diatomic molecules to open-shell atoms. [CH/sup +/ + h nu. -->. C/sup +/(2/sup 2/P/sub 1/2, 3/2/) + H(1/sup 2/S)]},
author = {Band, Y B and Freed, K F and Singer, S J and Williams, C J},
abstractNote = {Photodissociation of diatomic molecules to open-shell atoms is shown to be very strongly affected by nonadiabatic interactions when the photon energy is just above the threshold for dissociation. The energy dependences of photodissociation cross sections and various anisotropy parameters exhibit a wealth of structure in conformity with their theoretical predictions that nonadiabatic interactions between molecular states, approaching the same atomic term limit, lead to the emergence of resonance features in the spectra. Some of these features are associated with Feshbach and shape resonances on states that carry no oscillator strength in zeroth order. As an example, they consider the photodissociation cross sections for the production of individual C/sup +/(/sup 2/P/sub 3/2,1/2/) states from selected initial CH/sup +/ levels and the fragment angular distribution, orientation, and alignment. They discuss how totally oriented fragments can be produced by near-threshold photodissociation in a magnetic field.},
doi = {10.1021/j100305a005},
url = {https://www.osti.gov/biblio/5940945}, journal = {J. Phys. Chem.; (United States)},
number = ,
volume = 91:21,
place = {United States},
year = {Thu Oct 08 00:00:00 EDT 1987},
month = {Thu Oct 08 00:00:00 EDT 1987}
}