Photodissociation dynamics of C2H2, C2D2, and C2HD at 121.6 nm

Jeng Han Wang, Yen Tsung Hsu, Kopin Liu

Research output: Contribution to journalArticle

54 Citations (Scopus)

Abstract

The product translational energy distribution P(Et) and the recoil anisotropy parameter β(Et) for acetylene (and isotopic variants) photodissociation at 121.6 nm have been obtained by detecting the H(D) atom fragment using the Doppler-selected time-of-flight (TOF) technique. A strong propensity toward the formation of the C2H(Ã 2Π) fragment was revealed. The resolution of this technique is sufficiently high to resolve the vibrational structures of a small polyatomic molecule. The vibrational spectroscopic constants of the C-H and C-C stretching modes for the C2H(Ã 2Π) state were obtained for the first time, and the mode-specific vibrational state distributions were deduced. It is conjectured that two distinct dissociation pathways, arising from the Rydberg-valence surface intersections, are involved in the title processes. The branching of these two pathways is governed by the initial absorption step.

Original languageEnglish
Pages (from-to)6593-6602
Number of pages10
JournalJournal of Physical Chemistry A
Volume101
Issue number36
Publication statusPublished - 1997 Sep 4

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Photodissociation
Acetylene
Anisotropy
photodissociation
Stretching
fragments
Atoms
Molecules
polyatomic molecules
vibrational states
acetylene
intersections
energy distribution
dissociation
valence
anisotropy
products
atoms

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

Photodissociation dynamics of C2H2, C2D2, and C2HD at 121.6 nm. / Wang, Jeng Han; Hsu, Yen Tsung; Liu, Kopin.

In: Journal of Physical Chemistry A, Vol. 101, No. 36, 04.09.1997, p. 6593-6602.

Research output: Contribution to journalArticle

Wang, Jeng Han ; Hsu, Yen Tsung ; Liu, Kopin. / Photodissociation dynamics of C2H2, C2D2, and C2HD at 121.6 nm. In: Journal of Physical Chemistry A. 1997 ; Vol. 101, No. 36. pp. 6593-6602.
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