Nuclear gamma resonance studies on matrix-isolated FeCl 2 molecules at 4.2°K

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A study of the Mössbauer effect of FeCl 2 in solid argon and xenon matrices at 4.2°K gives for the monomer a quadrupole splitting = 0.62 ± 0.05 mm/sec and an isomer shift = 0.88 ± 0.05 mm/sec with respect to Fe metal at 300°K. In a xenon matrix the FeCl 2 molecules appear to be distributed between two different sites, one of which can be removed by annealing the matrix at 42°K.