Photoelastic studies of optically active crystals
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Double refraction and optical activity are studied by employing the Rayleigh Compensator and the photoelastic constants of NaClO3 have been redetermined, confirming the results obtained by Ramachandran and Chandrasekharan (1951). The photoelastic constants of NaBrO3, another T-class crystal, have been determined for the first time, employing the Rayleigh Compensator and also the elliptic analyser previously employed by Ramachandran and Chandrasekharan for studying NaClO3; and the results confirm the theoretical prediction of Bhagavantam (1942). The values for NaBrO3 are as follows:p 11=0·185;p 12=0·218;p 13=0·213;p 44=−0·0139 andq 11=1·63×10−13;q 12=2·58×10−13;q 13=2·45×10−13 q 44=−0·93×10−13 (all in units of cm.2 dyne−1).
KeywordsOptical Activity Active Crystal Path Difference Dark Band Sodium Chlorate
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