The absorption of SnTe vapour in the visible region of the spectrum has been studied in the temperature range 800-1400° C. in evacuated silica tubes. About 140 bands have been measured on plates taken in the first order of a 2.4-m. grating (dispersion similar 7.4 A./mm.). These have been assigned to four systems, one of which (D r harp over l X, ν e similar 25450 cm. -1 ) has already been observed in emission by Barrow, 1940 ( Proc. Phys. Soc. 52 , 380). The data for this molecule are summarized below:
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Barrow et al. (1944) studied this question.