Section III, 1922 [195] Trans. R.S.C. 



On Infra-Red Spectroscopy 



By Mr. V. P. Lubovich and Miss E. M. Pearen, B.A. 



University of Toronto, 



with 



Introductory note by Professor J. C. McLennan, F.R.S. 



(Read May Meeting, 1922) 



Introductory Note 



For many reasons it has become desirable to extend as far as 

 possible into the infra red region of spectra the use of various optical 

 methods that have been found to be applicable to the investigation of 

 the properties of radiations in the visible and ultraviolet portions of 

 spectra. 



To make the use of a number of these methods practicable it is 

 necessary to adopt the photographic method of recording spectra. 

 From the fine work of Meggers, Kiess, Merrill and Walters, and from 

 some limited work that has been carried out by the writer, it is now 

 clear that spectra can be photographed as far in the infra-red as X 

 11,000 A. The conditions under which such work can be done best 

 are not, however, as clear as they might be, and with a view to extend- 

 ing our knowledge in this regard, a series of investigations on infra-red 

 spectra and on photographic and other methods of recording them, 

 was recently carried out in the Physical Laboratory of the University 

 of Toronto. This work has been made possible through a grant 

 from the Honorary Advisory Council for Scientific and Industrial 

 Research of Canada, with which I was enabled to obtain the services 

 of Mr. V. P. Lubovich. 



In the following communication an account is given of some of 

 the results obtained which are likely to be of general interest. The 

 paper is divided into two parts, the one containing results obtained 

 for me by Mr. Lubovich, and the other results obtained by Miss 

 Pearen, who was able to devote only a limited portion of her time to 

 the investigation of some aspects of the problems before us. 



J. C. McLennan 



