Decay pathways and photofragment anisotropy parameters have been determined for a series of rovibrational levels of the g3Σ+g state in molecular hydrogen using fast-beam photofragment spectroscopy. The g 3Σ+g(v=4) levels are found to be weakly predissociated by homogeneous interaction with the lower lying n=2 a +g state and by rotational coupling with the i 3 πg state. The observed photofragment anisotropy reveals fine and hyperfine structure depolarization. The decay of g 3Σ+ g (v=5) levels is dominated by barrier tunneling. The anisotropy parameters identify the symmetry of the continuum to be of mixed Σ g and πg character, which implies that hydrogen molecules can tunnel through two different barriers. The determination of the kinetic energy and the anisotropy parameter of the photofragments have resulted in a number of spectral reassignments.

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Journal J. Chem. Phys.
Citation
Wouters, E. R, Buijsse, B, Los, J. H, & van der Zande, W. J. (1997). Dissociation dynamics of quasibound levels in the g 3 Σg state of H2: Characterization of the continuum. J. Chem. Phys., 106, 3974–3981.