Photodissociation dynamics of formyl fluoride (HFCO) at 193 nm: Branching ratios and distributions of kinetic energy
- National Synchrotron Radiation Research Center (NSRRC), 101 Hsin-Ann Road, Hsinchu Science Park, Hsinchu 30076, Taiwan (China)
Following photodissociation of formyl fluoride (HFCO) at 193 nm, we detected products with fragmentation translational spectroscopy utilizing a tunable vacuum ultraviolet beam from a synchrotron for ionization. Among three primary dissociation channels observed in this work, the F-elimination channel HFCO{yields}HCO+F dominates, with a branching ratio {approx}0.66 and an average release of kinetic energy {approx}55 kJ mol{sup -1}; about 17% of HCO further decomposes to H+CO. The H-elimination channel HFCO{yields}FCO+H has a branching ratio {approx}0.28 and an average release of kinetic energy {approx}99 kJ mol{sup -1}; about 21% of FCO further decomposes to F+CO. The F-elimination channel likely proceeds via the S{sub 1} surface whereas the H-elimination channel proceeds via the T{sub 1} surface; both channels exhibit moderate barriers for dissociation. The molecular HF-elimination channel HFCO{yields}HF+CO, correlating with the ground electronic surface, has a branching ratio of only {approx}0.06; the average translational release of 93 kJ mol{sup -1}, {approx}15% of available energy, implies that the fragments are highly internally excited. Detailed mechanisms of photodissociation are discussed.
- OSTI ID:
- 20723028
- Journal Information:
- Journal of Chemical Physics, Vol. 123, Issue 7; Other Information: DOI: 10.1063/1.2006093; (c) 2005 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-9606
- Country of Publication:
- United States
- Language:
- English
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