A DOUBLE-RESONANCE STUDY OF PREDISSOCIATION OF THE $J^{3}\Delta_{g}$ STATE OF $H_{2}$

Loading...
Thumbnail Image

Date

1988

Authors

Lembo, L. J.
Huestis, D. L.
Bjerre, Nis
Keiderling, T. A.
Helm, H.

Journal Title

Journal ISSN

Volume Title

Publisher

Ohio State University

Research Projects

Organizational Units

Journal Issue

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

Keywords

Citation