Abstract
The optical-absorption spectrum of the antiferromagnetic salt FeC has been measured. As many as 34 bands have been observed. In order to give a reasonable explanation of the observed spectrum, an ab initio—like calculation including a trigonal crystal field has been made. Three stronger bands at 24 390, 24 875, and 25 126 are interpreted in terms of two-center transitions of -ion pairs. The essential idea is the application of an analytical approximation of Watson's self-consistent-field procedure to obtain the spin-orbit interaction and the electrostatic parameters for the isolated ions. Crystal-field energy levels are then calculated using the nearest-neighbor point-ion approximation. Despite these approximations, the results are quite good.
- Received 1 July 1982
DOI:https://doi.org/10.1103/PhysRevB.28.6481
©1983 American Physical Society