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Quantum hydrogen vibrational dynamics in LiH: new neutron measurements and variational Monte Carlo simulations

J. Boronat·C. Cazorla·D. Colognesi·M. Zoppi
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Abstract

Hydrogen single-particle dynamics in solid LiH at T=20 K has been studied through the incoherent inelastic neutron scattering technique. A careful analysis of the scattering data has allowed for the determination of a reliable hydrogen-projected density of phonon states and, from this, of three relevant physical quantities: mean squared displacement, mean kinetic energy, and Einstein frequency. In order to interpret these experimental findings, a fully-quantum microscopic calculation has been carried out using the variational Monte Carlo method. The agreement achieved between neutron scattering data and Monte Carlo estimates is good. In addition, a purely harmonic calculation has been also performed via the same Monte Carlo code, but anharmonic effects in H dynamics were not found relevant. The possible limitations of the present semi-empirical potentials are finally discussed.

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J. Boronat, C. Cazorla, D. Colognesi, M. Zoppi. 2004-03-12. Quantum hydrogen vibrational dynamics in LiH: new neutron measurements and variational Monte Carlo simulations. https://doi.org/10.1103/physrevb.69.174302

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