C-Cl and C-H bond cleavage in 193 nm photodissociation of CH3CF2Cl and CH3CFCl2

A. Melchior, I. Bar, S. Rosenwaks

Research output: Contribution to journalArticlepeer-review

22 Scopus citations

Abstract

The relative amounts of Cl(2P3/2) [Cl], Cl(2P,1/2) [Cl*], H, and HCl produced by 193 nm photodissociation of CH3CF2Cl and CH3CFCl2 were studied by a laser pump-and-probe technique. An excimer laser photodissociated the parent molecules and a frequency doubled tunable dye laser probed the photofragments via ( 2 + 1 ) resonantly enhanced multiphoton ionization coupled with a time-of-flight mass spectrometer. Only atomic products were observed; no HCl was found. The profiles were well fitted to Gaussians. The Cl*/Cl branching ratios were almost identical, 0.18 ±0.04 and 0.16±0.04, while the H/(Cl+Cl*) ratios were 0.67±0.21 and 0.18±0.07, for CH3CF2Cl and CH3CFCl2, respectively. The mechanism for the production of the atomic species is discussed.

Original languageEnglish
Pages (from-to)8476-8482
Number of pages7
JournalJournal of Chemical Physics
Volume107
Issue number20
DOIs
StatePublished - 22 Nov 1997

ASJC Scopus subject areas

  • General Physics and Astronomy
  • Physical and Theoretical Chemistry

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