EMISSION SPECTRUM OF BURNING CARBON BISULPHIDE;. 



119 



coincidence of the emission and absorption bands led the writer to 

 undertake the present work. 



A previous examination of the absorption spectra of gases showed 

 very marked bands in SO, which were in quite close coincidence with 

 the emission lines of the products of combustion of carbon disulphid, 

 as given by Julius. The absorption spectrum 1 of CS 2 has a very large 

 absorption band at 6.8^ (opacity from 6.6 to 7.0/11) and smaller bands 



80 cm 



70 



60 



<n 



c 

 o 



4j 







* 



Q 



30 



20 



10 



5 6 7 Q 



FIG. 91. Emission of burning carbon disulphide. 



at 4.6 and 1 1.65 //,, while SO 2 has a very large band at 8.7 /j., a somewhat 

 narrower band at 7.4 p. and several small bands; H 2 S has a series of small 

 bands which can hardly be considered in the question of the combustion 

 products of CS 2 . In fig. 91 is given the emission curve of burning CS 2 . 

 In curve a the maximum at 4.35 ^ is reduced to one-half the scale of 

 the rest of the curve. In curve b the bands at 6.75 and 7.45 /* have been 

 magnified 10 times to bring out the sharpness of the maxima. In the 



1 See Investigations of Infra-Red Spectra, vol. I. 



