The acoustic paramagnetic resonance of x-irradiated ruby

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Abstract
The results of an acoustic paramagnetic resonance study of x-irradiated ruby using longitudinal ultrasonic waves at 9.1-9.6 ghz are presented. Most resonances are attributed to the cr2+ ion which is very strongly coupled to the lattice and is subject to a dynamic jahn-teller effect. Four principal resonances are observed with the magnetic field along the c axis at approximately 6.3 kg, 7.7 kg, 11.4 kg and 15.8 kg. These split up into several components as the field is turned away from the c axis. The results are in broad agreement with the theory of bates and dixon (1969). Lines due to other centres are observed.