LASER-INDUCED ESR SHIFT OF A PARAMAGNETIC TRANSITION-METAL COMPLEX ION [IRBR6](2-)

Taking a paramagnetic transition metal complex ion [IrBr6](2-) as an e xample, the laser-induced ESR shifts in oriented and unoriented sample s have been studied and calculated. In oriented and unoriented systems the ESR shifts result from the contribution of the symmetric and anti symmetric polarizabilities. The shifts of the [IrBr6](2-) complex ion are calculated to be of the order of 1 similar to 10 kHz for a laser b eam of 10 W cm(-2). The factors affecting the magnitude of the laser-i nduced ESR shift are discussed. The results indicate that there should be observable ESR shifts in a molecular or radical paramagnetic syste m on applying linearly or circularly polarized light at a frequency ne ar optical absorption. (C) 1998 Elsevier Science B.V. All rights reser ved.