TY - GEN
T1 - Utilization of stimulated Raman excitation and coherent anti-stokes Raman scattering in studies of bond- and mode-selective chemistry
AU - Arusi-Parpar, T.
AU - Cohen, Y.
AU - David, D.
AU - Bar, I.
AU - Rosenwaks, S.
PY - 1994/1/1
Y1 - 1994/1/1
N2 - The state resolved photodissociation of rovibrational states of the fundamental symmetric stretch of water, H2O (1,0,0), and of the O-H or O-D stretch vibrations of HOD was studied using laser induced fluorescence and Doppler polarization spectroscopy. The control that the initially selected state exerts over the product state distribution, vector correlations and bond selectivity was demonstrated. The specific energy deposition via the lowest level of vibrational excitation leads to the enhancement of bond breaking and to structured rotational state distributions of the OH fragment which depends on the prepared rotational state of the parent. The correlations are close to the maximum attainable values expected for an idealized orientation where the transition dipole moment of the parent is parallel to the fragment angular momentum and perpendicular to its velocity. The photodissociation of HOD in which the O-H stretch is initially excited, leads to enhanced bond breaking and selective production of OD + H, while when the O-D is excited no enhancement is obtained. These results show that experiments which prepare the parent molecule in a particular state before a second laser dissociates it, provide a powerful means for bond- and mode-selective chemistry and molecular dynamics studies.
AB - The state resolved photodissociation of rovibrational states of the fundamental symmetric stretch of water, H2O (1,0,0), and of the O-H or O-D stretch vibrations of HOD was studied using laser induced fluorescence and Doppler polarization spectroscopy. The control that the initially selected state exerts over the product state distribution, vector correlations and bond selectivity was demonstrated. The specific energy deposition via the lowest level of vibrational excitation leads to the enhancement of bond breaking and to structured rotational state distributions of the OH fragment which depends on the prepared rotational state of the parent. The correlations are close to the maximum attainable values expected for an idealized orientation where the transition dipole moment of the parent is parallel to the fragment angular momentum and perpendicular to its velocity. The photodissociation of HOD in which the O-H stretch is initially excited, leads to enhanced bond breaking and selective production of OD + H, while when the O-D is excited no enhancement is obtained. These results show that experiments which prepare the parent molecule in a particular state before a second laser dissociates it, provide a powerful means for bond- and mode-selective chemistry and molecular dynamics studies.
UR - http://www.scopus.com/inward/record.url?scp=0028409340&partnerID=8YFLogxK
U2 - 10.1051/jp4:19944201
DO - 10.1051/jp4:19944201
M3 - Conference contribution
AN - SCOPUS:0028409340
SN - 2868832202
SN - 9782868832207
T3 - Journal De Physique
SP - 725
EP - 728
BT - Journal De Physique
PB - Publ by Editions de Physique
T2 - Proceedings of the 3rd International Laser M2P Conference
Y2 - 8 December 1993 through 10 December 1993
ER -