Abstract
The method of Mossbauer Emission Spectroscopy (MES) allows to study the kinetics of chemical conversions (electron and spin relaxation) of Mossbauer emitters if the time of such conversions [MATH] is comparable to the life-time of Mossbauer level [MATH]. Rate constants of fast interionic electron transfer from 57Fe2+ (HS-high spin state) to [Fe(III)(CN)6]3- (LS-low spin state) in the transformation of Turnbull blue (TB) into the Prussian blue (PB) were measured at 400-I2 K by rapporteurs et al. (Moscow-Helsinki group) and it was found that the rate of this process reaches the low-temperature plateau value below ca.50 K. The observations of the rate of spin relaxation (HS→LS) for various dipyridyl and phenantroline complexes of iron performed by Mainz group at 293-4 K also have lead to the revealing of low-temperature plateau of the rate of such conversions. In such a way the MES has opened new possibilities of the studies of electron-nuclear tunneling which can be described on the base of the theory of the radiationless electron transitions.
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