Acoustic solid-effect in non cubic crystals

It is shown that noncubic crystals containing two types of nucleus with electric quadrupole moments and different spin-lattice interactions may exhibit the acoustic solid effect due to ultrasonic excitation of simultaneous transitions between quadrupole levels in both spin systems. The maximum dynamic polarization of the nuclei in LiIO3-type crystals is predicted for ultrasonic deformations whose amplitude is of the order of 10-5; this polarization should be 102-103, which is considerably greater than the dynamic polarization of nuclei in cubic crystals at Zeeman energy levels. A similar solid effect in nuclei which do not have quadupole moments, for example in HIO3 type crystals, may be obtained on application of an external magnetic field. If a crystal contains paramgnetic ions with a slightly split lower level, a considerable polarization of nuclei bound weakly to the lattice can be observed for purely quadrupole nuclear levels as a result of excitation of simulatneous electronic and nuclear transitions