Article
Photodissociation dynamics of doubly excited Rydberg states of molecular hydrogen
Journal of Chemical Physics
(1992)
Abstract
We have applied photofragment ion imaging to investigate the dissociation dynamics oflowlying,
doubly excited states of molecular hydrogen. A doubly excited electronic state is one in
which both of the hydrogen electrons reside in excited molecular orbitals. Two-step, two-color
multiphoton excitation of Hz, first via 201.8 nm, two-photon excitation into the
E, F I ~g+ (u E = 0, J = 1) state, followed by ~ 563 nm, 1 + m (m = 1, 2) excitation through
the B It I~u+ (u = 0, J = 0, 2), D Illu (u = 2, J = 1, 2), and B' I~u+ (u = 4, J = 0, 2) states
provides a ready means of populating several low-lying doubly excited states of Hz at
increasing internuclear separations. From these doubly excited repulsive states, both
dissociation and autoionization processes are possible. Because the excitation energy remains
relatively constant as each intermediate state is accessed, differences in the photodissociation
dynamics via each state can be ascribed directly to the effects of changing internuclear
separation and electronic symmetry of the intermediate and dissociative states. H + fragments
detected from each photodissociation pathway are distinguished by their differing velocities,
determined from an ion image.
Disciplines
Publication Date
April, 1992
Publisher Statement
Copyright 1992 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.
Citation Information
Mark A. Buntine, David P. Baldwin and David W. Chandler. "Photodissociation dynamics of doubly excited Rydberg states of molecular hydrogen" Journal of Chemical Physics Vol. 96 Iss. 8 (1992) p. 5843 - 5856 Available at: http://works.bepress.com/david-baldwin/1/