Spectrum of Sulphuryl Chloride

Abstract

KRONIG, Schaafsma and Peerlkamp1 have recently described measurements on the absorption spectrum of chromium oxychloride, which exhibits a somewhat unusual system of diffuse narrow bands in the region of 6000 A. The absorption spectrum of the closely related compound sulphuryl chloride has been studied using pressures of 1–100 mm. with an absorbing column of 50 mm. and over the range 5000–2000 A., and indicates certain features not unlike those reported in the case of chromium oxychloride. Between 3170 and 2800 A. a succession of about twenty narrow diffuse bands is observed (region A). These bands are not, except in the region of longer waves, equidistantly spaced, different intervals varying between 180 and 250 cm.1. In the intervals between the bands 1/2, 2/3, 3/4 (numbering from the long wave end), about four very faint absorption lines are visible, with equidistant spacing. There may be some definite pattern in the region as a whole, which more accurate analysis should reveal. From 2790 to 2730 A. there is a series of about eight similar absorption strips (region B) with markedly different frequency interval (c. 100 cm.1) from those in region A. From 2700 to 2620 A. occurs another much less intense series of some fifteen or more diffuse strips, with frequency separations of the order 100 cm.1 (region C). It is probable that the regions A, B and C are all related to the same electronic process. There are certain similarities in the system to that described in the spectrum of chromium oxychloride.