SPECTROSCOPY AND EXCITED STATE DYNAMICS OF BORON ATOM-RARE GAS AND $B-H_{2}$ VAN DER WAALS COMPLEXES
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Date
1996
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Ohio State University
Abstract
Laser fluorescence excitation spectra of the BNe, BAr, and $B-H_{2}$ van der Waals complexes, in the vicinity of the B atomic $2s2p^{2}{^{2}D}\leftarrow2s^{2}2p^{2}p$ transition at 208.9 nm, will be reported. For BNe, partially rotationally resolved bands of the $C^{2}\Delta-X^{2}\Pi_{1/2}$ and $D^{2}\Pi-X^{2}\Pi_{1/2}$ transitions, and unstructured excitation in the dissociation continuum to the blue, were observed. For BAr, fluorescence excitation was observed only for the $D^{2}\Pi-X^{2}\Pi_{1/2}$ transition, while no $B-H_{2}$ fluorescence could be detected in this wavelength range. To detect the non-fluorescing states, fluorescence depletion experiments were carried out. With this technique, the BAr $C^{2}\Delta-X^{2}\Pi_{1/2}$ transition, and electronic transitions in the $B-H_{2}$ complex, were observed. The BAr($C_{2}\Delta$) and $B-H_{2}^{*}$ apparently decay by predissociation and chemical reaction, respectively. The contrasting decay behavior of the excited states of BNe, BAr, and $B-H_{2}$ will be discussed in terms of our knowledge of electronic states of these complexes. Estimated binding energies of the BNe and BAr states will be presented.
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Author Institution: Department of Chemistry, The Johns Hopkins University