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IIG The Ohio Journal of Science [Vol. XVI, No. 4, 



or bands found in the spectra of the compounds studied are 

 indicated in the following data. The pressure in nearly every 

 case was about 2 mm. of mercury, but it was discovered that a 

 considerable range of pressure (from 0.5 to 10 mms. mercury) 

 had little effect upon the results. 



I. Iodides. 



Calcium Iodide. 



BANDS REMARKS 



'6075-5845 (.•') Seemingly continuous but uncertain. 



5615-5528 Fairly sharp on red side, diffuse at blue. 



5180-5100 



4830-4787 



4507-4465 " " " " " " " 



4438-4375 (?) Apparently continuous, but uncertain. 



Mercuric Iodide. 



BANDS REMARKS 



6072-5845 Sharp towards red, diffuse towards violet. 



5605-5535 



5195-5132 



4828-4788 



4506^470 More or less diffuse at both ends. 



4450-4375 



A few prominent lines were measured and identified as 

 follows: 6563 and 4861 due to hydrogen and 5790, 5769, 5461, 

 4916 and 4358 due to mercury. These lines were present at 

 all stages of operation of the tube. A considerable number of 

 iodine lines made their appearance on first heating the tube. 



Zi)ic Iodide. 



Upon the first heating of the zinc iodide the following 

 simple line spectrum of zinc and iodine was obtained; 5781, 

 5766 and 5448 of iodine, 5182 and 4912 of zinc and in addition 

 6563 of hydrogen and 4358 of mercury. 



With rather low heat the following bands were obtained: 

 .5610-5535; 5195-5116 and 4829-4780. All of these were 

 fairly sharp towards the red and diffuse toward the violet end. 

 A number of sharp lines were also present at this stage of the 

 experiment and a majority of these were measured; 6363, 

 5894, 4810, 4722, 4680 due to zinc; 6131, 6076, 5961, 5739, 

 5696, 5628, 5165, 4667, 4645, 4635 due to iodine and the fol- 

 lowing lines which have thus far not been identified — 6235, 

 6203, 6027, 5937, 5839, 5816, 5119. 



