Long-Time Relaxation of Stress-Induced Birefringence of Microcrystalline Alkali Halide Crystals.

ABSTRACT: Alkali halide single crystals are most commonly used as the diluent matrix in the tablet method or disk technique for spectroscopic measurements. However, stress-induced birefringence (SIB) of alkali halides as well as intrinsic birefringence manifest during the disk formation process. Thus, the true chiroptical measurement is disturbed by optical anisotropies (OA) containing SIB and intrinsic birefringence, except in the case of optical homogeneity. SIB is generally larger than intrinsic birefringence and has a value of several thousand millidegrees in the ultraviolet-visible wavelength range, although this varies with disk type. Here, to investigate the SIB origin, alkali halide crystals were examined using polarized light, X-ray diffraction, Fourier-transform infrared, and electron back

SUBMITTER: Ueno H 

PROVIDER: S-EPMC6017667 | biostudies-literature | 2018 Mar

REPOSITORIES: biostudies-literature