Physics – Chemical Physics
Scientific paper
Jul 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jchph..91..272w&link_type=abstract
Journal of Chemical Physics (ISSN 0021-9606), vol. 91, July 1, 1989, p. 272-280.
Physics
Chemical Physics
51
Absorption Cross Sections, Acetylene, Photoabsorption, Photodissociation, Synchrotron Radiation, Franck-Condon Principle, Gas Temperature, Light Sources, Temperature Dependence
Scientific paper
Employing synchrotron radiation as a continuum light source, the absolute photoabsorption and direct dissociation cross sections of C2H2 in the 1530-1930-A region have been obtained at 295 and 155 K. In comparison with cross sections measured at room temperature, it is found that the cross sections at absorption peaks typically increase by 10-40 percent, and that those at absorption valleys decrease by as much as 30 percent at 155 K. The absorption band profiles are shown to become narrower as the gas temperature decreases. The Franck-Condon principle is used to derive a repulsive potential energy curve of the direct dissociation state.
Caldwell J. Jr. J.
Chien T. S.
Judge Darrell L.
Liu Giovanni S.
Wu Chung-Yung Robert
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