Rotational-state dependent selectivity in the bond fission of C2HD (5ν1)

Communication: Mode-specific photodissociation of vibrationally excited pyrrole

“…Therefore, it seems that the difference in outcomes of photodissociation when vibrations of different character are excited occurs by the combined effects of restricted IVR and different FC factors, leading to yield enhancements and thus to state-specificity. The larger enhancement of the deformation overtone in pyrrole appears to be somewhat similar to that found in four atom molecules, C 2 HD, C 2 H 2 , and HNCO, as well as in CH 3 NH 2 , where excitation of combination bands including bending, 21,22 and bending overtones 25 affected considerably the FC factor and the bond fission.…”

“…The success in this triatomic prototype spurred additional experiments on four atom molecules, including isocyanic acid, HNCO, 21 acetylene, C 2 H 2 , and its deuterated isotopologue, C 2 HD, 22 and ammonia, NH 3 , and its single deutarated variants, NHD 2 and NH 2 D. 23,24 An even larger a) Electronic mail: ibar@bgu.ac.il.…”

Diode laser absorption spectrum of cold bands of C2HD at 6500cm−1

“…C 2 HD is of some considerable interest in its own right because of its isotope-dependent photochemistry. ArusiParpar et al [18] have noted that there is a substantial rota- Fig. 5.…”

Vibrationally mediated photodissociation of ethyne isotopologues and homologues revisited

“…VMP of the ethyne isotopologues C 2 H 2 [2][3][4][5][6][7][8][9][10][11][12][13] and C 2 HD [6,7,[13][14][15] revealed mode-and bond-selective cleavage of the C-H or C-D bond when the molecules were preexcited to vibrational states in the ground electronic state at energies around that of three, four or five C-H stretches. On the other hand, VMP of three ethyne homologues: (normal) propyne (H 3 CCCH) [16][17][18][19][20], propyne-d 3 (D 3 CCCH) [7,21,22] and 1-butyne (H 3 CH 2 CCCH) [12,19,[23][24][25], pre-excited to energies of up to five C-H acetylenic or alkylic vibrational stretchings, did not show mode-specific cleavage but, nevertheless, in some cases the energy flow out of the pre-excited states indicated mode-dependent coupling with close-lying bath states.…”