Abstract
Zeeman spectroscopy is not practicable for the investigation of the structure of electronic conventional states which give rise to broad optical absorption bands in solids. We have investigated the application of Faraday rotation and circular dichroism techniques to absorption bands of neutral silver atoms and
F
centres in alkali halides. These centres give rise to optical absorption bands due to transitions of the type
2
S
→
2
P
which are 2000 to 6000 cm
-1
in width because, in part, of strong coupling to lattice phonons. A discussion is given of information which may be obtained concerning the electonic states involved in the
2
S
→
2
P
transition by analysis of the magneto-optical effects by the method of moments. It is shown, for example, that the spin-orbit coupling constant of the
2
P
state of the silver atom is reduced from 613 cm
-1
in the free state to 365 cm
-1
in KCl, to 102 cm
-1
in KBr and to an unmeasurably small value in KI. This cancellation of spin-orbit interaction of the silver atom is assigned to symmetry allowed admixtures of lattice ion wavefunctions into the
2
P
state.
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