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

Jeng Han Wang; Yen Tsung Hsu; Kopin Liu

doi:10.1021/jp970536f

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

Jeng Han Wang, Yen Tsung Hsu, Kopin Liu^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

55 Citations (Scopus)

Abstract

The product translational energy distribution P(E_t) and the recoil anisotropy parameter β(E_t) 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 language	English
Pages (from-to)	6593-6602
Number of pages	10
Journal	Journal of Physical Chemistry A
Volume	101
Issue number	36
DOIs	https://doi.org/10.1021/jp970536f
Publication status	Published - 1997 Sept 4
Externally published	Yes

ASJC Scopus subject areas

Physical and Theoretical Chemistry

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title = "Photodissociation dynamics of C2H2, C2D2, and C2HD at 121.6 nm",

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({\~A} 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({\~A} 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.",

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T1 - Photodissociation dynamics of C2H2, C2D2, and C2HD at 121.6 nm

AU - Wang, Jeng Han

AU - Hsu, Yen Tsung

AU - Liu, Kopin

PY - 1997/9/4

Y1 - 1997/9/4

N2 - 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.

AB - 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.

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JF - Journal of Physical Chemistry A

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

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