Abstract
The Raman spectrum of barytes excited by the λ2536 radiation of the mercury arc has been studied at a series of eight temperatures ranging from 85° to 923°K., and data furnished regarding the variations in frequency shift and the width of the principal Raman lines. With increasing temperature a definite decrease in frequency shift is observed, the rate of decrease being greater at higher temperatures. While at low temperatures the internal frequencies of the SO4 ion are clearly split up into distinct components, these tend to coalesce as the temperature is increased. The lattice oscillations are observed to be much more temperature sensitive than the internal oscillations of the SO4 group. The 89 cm.−1 lattice line and the 648 cm.−1 internal frequency are comparatively the least affected by temperature variations.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
