Pinsook U, Hannongbua S. Model of saturated lithium ammonia as a single-component liquid metal.
J Chem Phys 2006;
124:74702. [PMID:
16497065 DOI:
10.1063/1.2168442]
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Abstract
We use the single-component picture and the nearly-free-electron theory for describing collective excitations in the saturated Li-ammonia solution. The physical justification is discussed, and all predictions are compared with current experimental findings. The plasmon dispersion and the long-wavelength dielectric function of the solution can be explained within the homogeneous-electron-gas theory. The parameters r(s) = 7.4a(0) and epsilon(infinity) = 1.44 give a good description compared with inelastic x-ray scattering and optical data. The phonon spectrum of the solution is also examined. Within the scope of the empty core model with R(c) = 3.76a(0), the phonon dispersion at low q is reproduced. The ratio BB(free) = 1.34 is compared with 1.63 obtained from experiments.
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