Rotational analysis of bands of the 3400 Å system of disulphur monoxide (S₂O)

Abstract

S 2 O has been prepared in a flow system, and various bands at the long wavelength end of the 3400 Å electronic transition photographed in absorption at high dispersion. Rotational analysis of the bands at 3235 and 3278 Å has shown that the bands are type A–B hybrids, with the type A component accounting for nearly all the observed structure. The electronic transition is therefore 1 A′– 1 A′ (ππ*). The rotational constants imply the upper state structure r(S—S) = 2.14 Å, [Formula: see text], with r(S—O) = 1.50 Å (assumed).The vibrational intensity pattern is found to be in agreement with this structure if the electronic origin is placed at 29 696 cm −1 (3367 Å).