Secondary decomposition of C3H5 radicals formed by the photodissociation of 2-bromopropene

Haiyan Fan, Stephen T. Pratt, James A. Miller

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

The photodissociation of 2-bromopropene at 193 nm produces C3 H5 radicals with a distribution of internal energies that spans the threshold for the secondary decomposition of the 2-propenyl radicals into C3 H4 +H. Just above this threshold, the decomposition rate is on the nanosecond time scale, and in the present study, time-resolved velocity-map ion imaging is used to gain insight into this process. The results provide information on the energy dependence of the secondary dissociation process. In addition, comparison of the results with theoretical predictions of the energy dependence of the dissociation rate provides information on the branching between fragment rotational and vibrational energies in the primary photodissociation process.

Original languageEnglish
Article number144301
JournalJournal of Chemical Physics
Volume127
Issue number14
DOIs
Publication statusPublished - 2007
Externally publishedYes

Fingerprint

Photodissociation
photodissociation
Decomposition
decomposition
Time and motion study
dissociation
thresholds
Ions
internal energy
Imaging techniques
energy
fragments
predictions
ions

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Secondary decomposition of C3H5 radicals formed by the photodissociation of 2-bromopropene. / Fan, Haiyan; Pratt, Stephen T.; Miller, James A.

In: Journal of Chemical Physics, Vol. 127, No. 14, 144301, 2007.

Research output: Contribution to journalArticle

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AB - The photodissociation of 2-bromopropene at 193 nm produces C3 H5 radicals with a distribution of internal energies that spans the threshold for the secondary decomposition of the 2-propenyl radicals into C3 H4 +H. Just above this threshold, the decomposition rate is on the nanosecond time scale, and in the present study, time-resolved velocity-map ion imaging is used to gain insight into this process. The results provide information on the energy dependence of the secondary dissociation process. In addition, comparison of the results with theoretical predictions of the energy dependence of the dissociation rate provides information on the branching between fragment rotational and vibrational energies in the primary photodissociation process.

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