title: Selective photodissociation of O-H and O-D bonds from ground vibrational state of HOD using simple UV pulses.
abstract: Selective cleaving of both O-H and O-D bonds in HOD is achieved using reasonably simple UV pulses to excite the HOD molecule in its ground vibrational state to the repulsive first excited A ((1)B(1)) surface. Detailed theoretical analysis of population transfer and flux in the H+O-DH-O+D channels reveals an important preparatory role for the cross-talk between the participating levels and a possible role for the beat structure of the population transfer oscillations in facilitating selective dissociation. Excitation using a 50 fs single color 67,169 cm(-1) laser pulse achieves a branching ratio H+O-DH-O+D=5.64 with 82% flux in the H+O-D channel and 15% in the H-O+D channel. A two color 50 fs laser pulse with frequencies of 54 920 and 52 303 cm(-1) provides a branching ratio of H-O+DH+O-D=2.83 and 52% flux in the H-O+D channel and 18% in the H+O-D channel.
authors.affiliation: Department of Chemistry, Indian Institute of Technology, Bombay, Powai 400076, India.
authors.forename: Manabendra
authors.initials: M
authors.lastname: Sarma
authors.forename: S
authors.initials: S
authors.lastname: Adhikari
authors.forename: Manoj K
authors.initials: MK
authors.lastname: Mishra