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The Photodissociation of Ground and Vibrationally Excited Halogenated Alkanes
Author(s) -
Melchior Aviva,
Mark Lambert H.,
Dagdigian Paul J.,
Bar Ilana,
Rosenwaks Salman
Publication year - 1997
Publication title -
israel journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.908
H-Index - 54
eISSN - 1869-5868
pISSN - 0021-2148
DOI - 10.1002/ijch.199700051
Subject(s) - chemistry , photodissociation , excited state , dissociation (chemistry) , overtone , ionization , ground state , resonance enhanced multiphoton ionization , photochemistry , mass spectrometry , atomic physics , photoionization , spectral line , ion , physics , organic chemistry , astronomy , chromatography
The dynamics of photodissociation of small halogenated alkanes, in both their ground and vibrationally excited states, is investigated. The yield of H, Cl( 2 P 2/3 ), and Cl( 2 P 1/2 ) fragments was measured by (2 + 1) resonance‐enhanced multiphoton ionization in a time‐of‐flight mass spectrometer. We report results from the 193 nm photolysis of ground state CHF 2 Cl, CH 3 CF 2 Cl, CH 3 CFCl 2 , and OH 3 Cl and the 237–243 nm photolysis of CH 3 Cl excited to the fourth C–H stretch overtone level. The branching ratios depend on the molecular structure, the accessed excited potential surfaces and, as a consequence, on the dissociation dynamics.
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