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Laser-induced flourescence studies of C3 formation and isomerization in the 193 nm photolysis of allene and propyne

✍ Scribed by Xueyu Song; Yihan Bao; Randall S. Urdahl; Jaimini N. Gosine; William M. Jackson

Publisher: Elsevier Science
Year: 1994
Tongue: English
Weight: 488 KB
Volume: 217
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(93)e1377-s

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✦ Synopsis

The quantum state distributions of the C, radical from the UV multiphoton dissociation of allene and propyne in a pulsed molecular beam have been measured. The observed distributions for both molecules are identical and are much colder than a phase space model would predict, implying that direct dissociation is occurring in one step and isomerization in another. It is concluded that both allene and propyne undergo internal conversion from the S1 state to the vibrationally excited Sa ground state of allene followed by molecular elimination of Hr. The observed Cs is then produced by molecular elimination of H2 from the secondary photolysis of CsH2.

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