A DOUBLE-RESONANCE STUDY OF PREDISSOCIATION OF THE $J^{3}\Delta_{g}$ STATE OF $H_{2}$
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Date
1988
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Publisher
Ohio State University
Abstract
A fast-beam photoionization-photodissociation double-resonance technique has been employed to excite transitions from selected rovibrational levels of the metastabe $c^{3}\Pi_{u}^{-}$ state to the rapidly predissociated $j^{3}\Delta_{g}$ state of $H_{2}$. Vibrational levels $v^{\prime} - 7 - 14$ and $v - 7 - 12$ were observed (with $N^{\prime} - 2$, and for $v^{\prime} - 12, N^{\prime} - 3,4$ as well). The derived term energies in both states are in good agreement with $theory.^{1,2}$ Predissociation of the $j^{3}\Delta_{g}$ state arises from coriolis interaction with the vibrational continuum of the $f^{3}\Pi_{g}$ state. The photodissociation resonances are slightly asymmetric, and have widths that decrease with increasing $v^{\prime}$ from 29 to $10 cm^{-1}$. Calculated predissociation widths show the same vibrational trend, but are consistently 30*** smaller. Five narrow $(1.7 - 4 cm^{-1})$ photodissociation resonances were also observed. We attribute these to $Q(1)$ and $R(1)$ transitions to the $n-4 ^{3}\Pi_{g}$ state.
Description
This work was supported by NSF and AFOSR. $^{1}$ W. Kolos and J. Rychhewski, J. Mol. Spec. 66, 428 (1977). $^{2}$ J. Rychlewski, J. Mol. Spec. 104, 253 (1984).
Author Institution: Molecular Physics Department, SRI International; Institute of Physics, University of Aarhus
Author Institution: Molecular Physics Department, SRI International; Institute of Physics, University of Aarhus