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Differing reactivities in the predissociation of acetylene isotopomers pre-excited with three CH stretching quanta

Authors
Journal
Chemical Physics Letters
0009-2614
Publisher
Elsevier
Publication Date
Volume
361
Identifiers
DOI: 10.1016/s0009-2614(02)00954-5
Disciplines
  • Musicology
  • Physics

Abstract

Abstract Selective photolysis of a mixture of acetylene isotopomers prepared in rovibrational states lying in the energy window of the second overtone of CH stretches was performed. Tunable near infrared (NIR) photons prepared the isotopomers in initial states and ultraviolet photons both promoted them to the excited electronic trans-bent A ̃ 1 A u state and tagged the H(D) photofragments via (2+1) resonantly enhanced multiphoton ionization. Photoacoustic spectroscopy monitored the initial state preparation and action spectroscopy simultaneously tagged the H(D) photoproducts yield as a function of the wavelength of the exciting NIR laser. The measurements and analysis indicate differing dissociation efficacies in C 2H 2 and C 2HD revealing enhanced CH bond cleavage in the former and hindered CH(D) bond fission in the latter. The enhancement is a result of coincident resonances with the upper state leading to sharp structures in the photodissociation cross-section of C 2H 2.

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