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Radiation-induced defects in LiYF 4 have been studied using optical and ESR techniques. A pi -polarised absorption band at 3.99 eV is identified as the (F 2 - ) centre. An optical band at 3.70 eV has polarisation properties characteristic of dipoles oriented in the direction of Y 3+ -Y 3+ pairs. This band is a candidate for the F centre. Other optical bands with pi -polarisation at 3.02 eV and with sigma polarisation at 2.29 eV and 2.88 eV were not identified. These optical bands occur in nominally pure samples and also in samples doped with 1%Pr 3+ and Er 3+ .
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Renfro et al. (1980) studied this question.
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