V Chandrasekharan

TL;DR: Sodium chlorate is the first crystal belonging to the tetrahedrite class (T) of the cubic system for which photoelastic constants have been measured as mentioned in this paper, using a petrological microscope in conjunction with the stressing apparatus and measuring the ellipticity and other characteristics of the light transmitted by the crystal.

TL;DR: Sodium chlorate is the first crystal belonging to the tetrahedrite class (T) of the cubic system for which photoelastic constants have been measured as discussed by the authors, using a petrological microscope in conjunction with the stressing apparatus and measuring the ellipticity and other characteristics of the light transmitted by the crystal.

TL;DR: In this paper, it was shown that the doublet centred at 4152 A occurring in the spectrum of all fluorescing diamonds arises from "forbidden" transitions analogous to the forbidden 3P-1D and 1D-1S transitions in C I. On the basis of this analogy, fluorescence lines are also expected to occur at about 8816 A and 7849 A.