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Showing papers by "S. Chandrasekhar published in 1956"


Journal ArticleDOI
TL;DR: In this paper, a simple theoretical model for explaining optical activity is described, which consists of two anisotropic atoms, each having polarizability α, and when there is an assembly of such models, the refractive indices for right and left circular light are different, which means that the medium possesses optical rotatory power.
Abstract: The paper describes a simple theoretical model for explaining optical activity. The model consists of two anisotropic atoms, each having polarizability α. It is shown that when there is an assembly of such models, the refractive indices for right and left circular light are different, which means that the medium possesses optical rotatory power. By taking α to be complex in the vicinity of an optically active absorption band, the main features of Cotton effect or circular dichroism have also been explained.

9 citations


Journal ArticleDOI
TL;DR: In this paper, the integrated intensity of a particular reflexion for X-rays polarized perpendicular and parallel to the plane of incidence is estimated without making any special assumptions as to the nature of the extinction, i.e., whether it is primary or secondary.
Abstract: A method of effecting a first-order correction for extinction in crystals is suggested. It involves an accurate measurement of the integrated intensity of a particular reflexion for X-rays polarized perpendicular and parallel respectively to the plane of incidence. The change of polarizaton alters the effective structure factor, and consequently the extinction, by a known quantity. It is shown that from the resulting two relations for the integrated intensity |F| may be estimated without making any special assumptions as to the nature of the extinction, i.e., whether it is primary or secondary or both.

5 citations