Light Absorption by Impurity Centres and Urbach's Rule

1 January 1969

journal article
research article
Published by Wiley in Physica Status Solidi (b)

Vol. 32 (2) , 703-714
https://doi.org/10.1002/pssb.19690320223

Abstract

An investigation is made of the shape of the absorption spectra due to impurity centres in a solid, taking into account the variation of its quasi‐elastic constants during phototransitions in impurity centres. An analytical expression for the long‐wavelength edge of the absorption curve, similar to the well‐known Urbach rule, is obtained.

Keywords

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