Laser vaporization of metallic tin is used to generate Sn, molecules in effusive and supersonic expansions. Laser-induced fluorescence studies using isotopic samples of '"Sn established the correct vibrational numbering in the excited FO; and determined the Sn, molecular constants. From the convergence limit of the upper state the Sn, dissociation energy was determined to be 15 330*25 cm-', in good agreement with recent ab initio theoretical predictions.

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