Abstract
Acoustic paramagnetic resonance experiments have been made on calcium fluoride crystals doped with cerium, neodymium and samarium using longitudinal ultrasonic waves at about 9.4 GHz. Strong resonances have been observed for each of these three ions and are attributed to transitions within the Gamma 8 ground state of the trivalent ions. In the case of Ce3+ the cubic crystal-field interaction must be taken to second order to account for the resonance. For Nd3+ a first-order crystal-field calculation will explain the resonance while for Sm3+ the crystal-field calculation must be taken to second order and the Jahn-Teller effect invoked to explain the resonance.
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