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

Jeng Han Wang, Yen Tsung Hsu, Kopin Liu*


研究成果: 雜誌貢獻期刊論文同行評審

55 引文 斯高帕斯(Scopus)


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.

頁(從 - 到)6593-6602
期刊Journal of Physical Chemistry A
出版狀態已發佈 - 1997 9月 4

ASJC Scopus subject areas

  • 物理與理論化學


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