Abstract
Rotational constants of SnS in its lowest state and one excited state have been determined from the (0,0) and (1,0) bands of the visible system. Empirical formulae were used to determine the combination differences. The constants determined are B=0.140 cm1 and re=2.18A for the upper state of the visible system and B=0.157 cm1 and re=2.01A for the lowest state of the molecule.

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