Photodissociation dynamics of fluorobenzene (C6 H5 F) at 157 and 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 journalArticlepeer-review

12 Scopus citations

Abstract

Following photodissociation of fluorobenzene (C6 H5 F) at 193 and 157 nm, we detected the products with fragmentation-translational spectroscopy by utilizing a tunable vacuum ultraviolet beam from a synchrotron for ionization. Between two primary dissociation channels observed upon irradiation at 193 (157) nm, the HF-elimination channel C6 H5 F→HF+ C6 H4 dominates, with a branching ratio of 0.94±0.02 (0.61±0.05) and an average release of kinetic energy of 103 (108) kJ mol-1; the H-elimination channel C6 H5 F→H+ C6 H4 F has a branching ratio of 0.06±0.02 (0.39±0.05) and an average release of kinetic energy of 18.6 (26.8) kJ mol-1. Photofragments H, HF, C6 H4, and C6 H4 F produced via the one-photon process have nearly isotropic angular distributions. Both the HF-elimination and the H-elimination channels likely proceed via the ground-state electronic surface following internal conversion of C6 H5 F; these channels exhibit small fractions of kinetic energy release from the available energy, indicating that the molecular fragments are highly internally excited. We also determined the ionization energy of C6 H4 F to be 8.6±0.2 eV.

Original languageEnglish
Article number144301
Number of pages7
JournalJournal of Chemical Physics
Volume125
Issue number14
DOIs
StatePublished - 20 Oct 2006

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