Quantum molecular tunneling of NH4 + ions in mixed ammonium-alkali halide systems |
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Authors: | R Mukhopadhyay |
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Affiliation: | (1) Solid State Physics Division, Bhabha Atomic Research Centre, 400 085 Bombay, India |
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Abstract: | The rotational excitations of NH4 + ions in dilute solution in metal alkali halide lattices have been studied at 4K by inelastic neutron scattering technique. It is found that the ions exist in matrix isolation at very low ammonium ion concentration,c (c → 0), and it transforms to orientational glass phase on increase ofc. It is shown that the onset of the orientational glass phase is moderated through the strain field generated by the substituted impurity in the lattice. The variation of the intensity profiles with increase ofc have been successfully explained by a phenomenological model based on gaussian distributed heights. |
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Keywords: | Quantum tunneling neutron scattering NH4 + ion |
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