Linearer Stark-Effekt desR-Zentrums in LiF
A linear Stark effect of theR center is observed by studying theR2 zero-phonon line in X-irradiated LiF crystals in high electric fields. A detailed description of the experimental equipment is given. The Stark effect is investigated under various conditions of field direction, field strength and temperature. The changes of theR2 zero-phonon line, caused by the electric field, are analysed by means of the method of moments. The results are consistent with the theory forE→A transitions in a center withC3v-symmetry. By cooling the samples from 4.2 to 1.7 °K the zero-field splitting of theR center ground state was found to be <2 cm−1.