INFRARED-INDUCED PROCESSES IN A DISORDERED CRYSTAL OF A TUTTON SALT

Hole burning of the four N-D stretching bands of NH3D+ in a mixed Tutt on salt [(NH4)(2)Co0.25Ni0.75(H2O)(6)(SO4)(2)], dilute in NH3D+ and HD O, has been investigated. The burning changes the orientational distri bution of the NH3D+ ions. Relaxation in the dark of the altered distri bution is accompanied by slower changes of the HDO molecules. The moti on of the HDO molecules demonstrates long-range coupling among the ori entational coordinates of the molecules in the crystal and the propaga tion of strain through the crystal.