MOSSBAUER QUADRUPOLE RESONANCE IN FE57 SINGLE CRYSTALS.
Technical rept. no. 4,
CARNEGIE INST OF TECH PITTSBURGH PA
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If a compound containing Fe57 exhibits a two line Mossbauer absorption spectrum, as is the case for most paramagnetic ferrous salts, then this spectrum may usually be attributed to the electrostatic interaction between an electric field gradient EFG and the quadrupole moment of the first excited state of the Fe57. Since the EFG may be represented as a traceless, symmetric tensor of the second rank, it is completely specified by five independent parameters. If the absorber is a single crystal, the two absorption peaks will generally have different intensities, the ratio of the intensities depending upon the orientation of the incident, unpolarized radiation relative to the crystal axes. A general method is developed which utilizes this intensity ratio to determine the five parameters of the EFG. The method is applied to FeCl2.4H2O and the measured EFG parameters are utilized to approximately determine the crystalline ground state wave function of the ferrous ion in this salt. Author