Photodissociation dynamics of formyl fluoride (HFCO) at 193 nm: Branching ratios and distributions of kinetic energy

Shih Huang Lee*, Chia Yan Wu, Sheng Kai Yang, Yuan-Pern Lee

*Corresponding author for this work

Research output: Contribution to journalArticle

12 Scopus citations

Abstract

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→HCO+F dominates, with a branching ratio ∼0.66 and an average release of kinetic energy ∼55 kJ mol-1; about 17% of HCO further decomposes to H+CO. The H-elimination channel HFCO→FCO+H has a branching ratio ∼0.28 and an average release of kinetic energy ∼99 kJ mol -1; about 21% of FCO further decomposes to F+CO. The F-elimination channel likely proceeds via the S1 surface whereas the H-elimination channel proceeds via the T1 surface; both channels exhibit moderate barriers for dissociation. The molecular HF-elimination channel HFCO→HF+CO, correlating with the ground electronic surface, has a branching ratio of only ∼0.06; the average translational release of 93 kJ mol-1, ∼15% of available energy, implies that the fragments are highly internally excited. Detailed mechanisms of photodissociation are discussed.

Original languageEnglish
Article number074326
JournalJournal of Chemical Physics
Volume123
Issue number7
DOIs
StatePublished - 1 Dec 2005

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