Computer Science
Scientific paper
Dec 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998phdt........19s&link_type=abstract
Thesis (PHD). UNIVERSITY OF CALIFORNIA, DAVIS , Source DAI-B 59/06, p. 2775, Dec 1998, 124 pages.
Computer Science
1
Ethynyl, Comet Hyakutake, Diatomic Carbon
Scientific paper
The photodissociation dynamics of the ethynyl free radical, C2H has been studied using a nanosecond pump-probe laser technique. The nascent quantum state distributions of the C2 photofragment were measured. Statistical and non-statistical theories were employed to model the measured distributions. All of the measured distributions were found to be statistical in nature and this fact was interpreted as indicating the presence of a long lived intermediate. From these distributions, information about the excited state potential energy surfaces (PESs) has been inferred. It has been found that for nearly all of the measured electronic states, the excited state PESs play a major role. Namely, nonadiabatic transitions are significant, especially for the dissociation pathway leading to the formation of ground state C2. The electronic state distribution reveals that [ C]2/ (A/ 1Πu) is formed with the largest population among the states measured. The branching ratios for the X:A:B' channels were found to be 1:19:1.4. Our measurements of the internal state distributions of the ground state C2 were applied to the Hubble Space Telescope measurements of C2 in Comet Hyakutake. Through comparative arguments, we have shown that C2H is the major source of diatomic carbon in comets.
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