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Proceedings Paper

State-selective dissociation of acetylene isotopomers
Author(s): R. P. Schmid; Y. Ganot; Talya Arusi-Parpar; R.-J. Li; Illana Bar; Salman Rosenwaks
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Paper Abstract

Rovibrational excitation combined with promotion of C2HD/C2H2 molecules to the excited electronic trans-bent states A 1Au/B 1Bu and photofragment ionization are used to generate action spectra and Doppler profiles. Rovibrational states of C2HD and C2H2 are photodissociated by approximately 243.1 nm photons that also probe the H/D fragments. The yield of both H/D photofragments is greatly enhanced upon rovibrational excitation of both isotopomers. In the photolysis of C2HD several couples of rotational transitions, terminating at the same upper rotational state, stand out from the rotational contour and the H/D branching ratio is rotationally state dependent. In C2H2 photolysis the transition intensities of the combination bands that involve high stretch and low bend excitation, (1410020) and (20311)0), are close to that of the fourth overtone of the C-H stretch, (2030000). In addition, in C2H2 some couples of rotational transitions stand out form the rotational contour, and the R(13) line of the (2030000) state shows anomalous intensity. The mechanism for the photoproducts preference in C2HD and for intensity enhancement in C2H2 is discussed.

Paper Details

Date Published: 15 May 1998
PDF: 8 pages
Proc. SPIE 3271, Laser Techniques for State-Selected and State-to-State Chemistry IV, (15 May 1998); doi: 10.1117/12.308414
Show Author Affiliations
R. P. Schmid, Ben-Gurion Univ. of the Negev (Israel)
Y. Ganot, Ben-Gurion Univ. of the Negev (Israel)
Talya Arusi-Parpar, Ben-Gurion Univ. of the Negev (Israel)
R.-J. Li, Ben-Gurion Univ. of the Negev (Israel)
Illana Bar, Ben-Gurion Univ. of the Negev (Israel)
Salman Rosenwaks, Ben-Gurion Univ. of the Negev (Israel)

Published in SPIE Proceedings Vol. 3271:
Laser Techniques for State-Selected and State-to-State Chemistry IV
John W. Hepburn; Robert E. Continetti; Mark A. Johnson, Editor(s)

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