Probe of I(P-2(j)) atoms using two-photon resonant four-wave mixing spectroscopy following the 266-nm photodissociations of various alkyl and perfluoroalkyl iodides

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Two-photon resonant four-wave mixing spectroscopy has been utilized successfully for probing I and I* nascent from the 266 nm photodissociations of various alkyl and perfluoroalkyl iodides. The relative quantum yields for I*, as well as the recoil anisotropy parameters, were extracted. Recoil anisotropy parameters close to the limit value for parallel transition indicates that the ground-state I(P-2(3/2)) originates from the curve crossing from the initially prepared (3)Q(0) to (1)Q(1) state. The curve-crossing probabilities for alkyl and perfluoroalkyl iodides were obtained and tried to explain using the well-known Landau-Zener model. In the cases of perfluoroalkyl iodides, it is necessary to consider the fluorination effect to describe the detailed dynamics observed in this study and has been revealed that the electronic effect due to fluorine atom substitution is dominant, leading to decrease in the curve-crossing probability. (c) 2008 Elsevier Inc. All rights reserved.
Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
Issue Date
2008-05
Language
English
Article Type
Article
Keywords

POTENTIAL-ENERGY SURFACES; TERT-BUTYL HYDROPEROXIDE; ULTRAVIOLET PHOTODISSOCIATION; QUANTUM YIELDS; AB-INITIO; DYNAMICS; NM; CH3I; FLAMES; I-ASTERISK(P-2(1/2))

Citation

JOURNAL OF MOLECULAR SPECTROSCOPY, v.249, no.1, pp.43 - 50

ISSN
0022-2852
DOI
10.1016/j.jms.2008.01.010
URI
http://hdl.handle.net/10203/88408
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