Ultraviolet photodissociation of the HCCO radical studied by fast radical beam photofragment translational spectroscopy
- Department of Chemistry, University of California, Berkeley, California 94720 (United States)
The ultraviolet photolysis of jet-cooled mass-selected ketenyl radicals has been investigated using the technique of fast radical beam photofragment translational spectroscopy. The {tilde {ital C}}{sup 2}{Pi}({sup 2}{ital A}{sup {double_prime}}){endash}{tilde {ital X}}{sup 2}{ital A}{sup {double_prime}} photofragment yield cross section spans 33400{endash}48000 cm{sup {minus}1} and exhibits resolved resonances and broad continua. Dissociation produces both ground and excited state CH radicals in association with ground state CO fragments; there is no evidence for H atom elimination. Analysis of the photofragment kinetic energy release spectra yield a value for the C{endash}C bond dissociation energy and heat of formation of HCCO: D{sub 0}(HC{endash}CO)=3.14{plus_minus}0.03 eV (72.4{plus_minus}0.7 kcal/mol) and {Delta}{ital H}{sub {ital f},0}{sup 0}(HCCO)=1.82{plus_minus}0.03 eV (42.0{plus_minus}0.7 kcal/mol). {copyright} {ital 1996 American Institute of Physics.}
- Research Organization:
- Lawrence Berkeley National Laboratory
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 383751
- Journal Information:
- Journal of Chemical Physics, Journal Name: Journal of Chemical Physics Journal Issue: 14 Vol. 105; ISSN JCPSA6; ISSN 0021-9606
- Country of Publication:
- United States
- Language:
- English
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