TY - JOUR
T1 - Differing reactivities in the predissociation of acetylene isotopomers pre-excited with three C-H stretching quanta
AU - Ganot, Yuval
AU - Sheng, Xinzhi
AU - Bar, Ilana
AU - Rosenwaks, Salman
N1 - Funding Information:
The support of this research by the Israeli Science Foundation (ISF) under Grant No. 29/99-2 and by the James Franck Binational German–Israeli Program in Laser–Matter Interaction is gratefully acknowledged. We also appreciate the critical reading of the manuscript by Professor P.J. Dagdigian.
PY - 2002/7/24
Y1 - 2002/7/24
N2 - 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 à 1Au 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) photo-products yield as a function of the wavelength of the exciting NIR laser. The measurements and analysis indicate differing dissociation efficacies in C2H2 and C2HD 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 C2H2.
AB - 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 à 1Au 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) photo-products yield as a function of the wavelength of the exciting NIR laser. The measurements and analysis indicate differing dissociation efficacies in C2H2 and C2HD 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 C2H2.
UR - http://www.scopus.com/inward/record.url?scp=0037167134&partnerID=8YFLogxK
U2 - 10.1016/S0009-2614(02)00954-5
DO - 10.1016/S0009-2614(02)00954-5
M3 - Article
AN - SCOPUS:0037167134
SN - 0009-2614
VL - 361
SP - 175
EP - 181
JO - Chemical Physics Letters
JF - Chemical Physics Letters
IS - 1-2
ER -