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The High-Lying Vibrational Levels and Dissociation Energy of the a3Σ+u State of 7Li2

✍ Scribed by C. Linton; F. Martin; A.J. Ross; I. Russier; P. Crozet; A. Yiannopoulou; Li Li; A.M. Lyyra

Publisher
Elsevier Science
Year
1999
Tongue
English
Weight
159 KB
Volume
196
Category
Article
ISSN
0022-2852

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✦ Synopsis

Perturbation-facilitated optical-optical double resonance (PFOODR) has been used to access the 2 3 ⌸ g state of 7 Li 2 via the

3 2 3 ⌸ g excitation scheme using two single-mode tunable lasers. The selected ( A 1 ⌺ u ϩ ϳ b 3 ⌸ u ) mixed level provides a gateway through which the triplet manifold can be accessed. Fluorescence from single rovibrational levels of 2 3 ⌸ g to the a 3 ⌺ u ϩ state was detected at high resolution using a Fourier transform spectrometer. Transitions to v ϭ 0-9 in the a 3 ⌺ u ϩ state were observed, covering the potential well almost to the dissociation limit. The data were analyzed using a near dissociation expansion (NDE) technique and the resulting vibrational and rotational parameters were used to calculate a new RKR potential curve which reproduced the observed energy levels to within a rms error of 0.02 cm Ϫ1 . The following parameters were obtained for the a 3 ⌺ u ϩ state: D 0 ϭ 301.829 Ϯ 0.015 cm Ϫ1 , D e ϭ 333.69 Ϯ 0.10 cm Ϫ1 , T e ϭ 8183.12 Ϯ 0.12 cm Ϫ1 .

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