Laser induced fluorescence study of the HeBr2 van der Waals complex

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Abstract
The HeBr2 van der Waals complex has been observed in a free jet expansion. The complex was detected by laser excitation of the bands associated with the Br2(B−X) system. High resolution (0.05 cm−1) spectra have been recorded for the 11‐0 to 38‐0 bands. The rotational structure has been resolved for several bands and the analysis is found to be consistent with a rigid T‐shaped geometry. The distance from the Br2 bond center to the He atom is 3.8 A and 3.7 A for the excited and ground states, respectively. Vibrational predissociation of the He–Br2 bond has been observed via homogeneous broadening of the rotational lines. Predissociation rates, derived from the line shape data, showed a strong dependence on the Br2 vibrational excitation. Rates varied from 1010 s−1 for v′=11, up to 5×1011 s−1 for v′=38. The data can be adequately described by a simple ‘‘energy gap’’ model for the predissociation probability.

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