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GROUND STATE PROPERTIES OF QUANTUM CRYSTALS
EXCITED STATES IN QUANTUM CRYSTALS
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anisotropic Argon Boer parameters Brillouin zone Buckingham potential cc/mole cluster expansion CM CM CM CM CO St CM H CM ov CM rH CM St Comparison computed configurations correlated Gaussian corresponding Debye model discussed dispersion curve distribution Domb Domb-Salter approximation equation estimated excited experimental data factor finite force constants frequency ground state energy ground state properties ground state wave H CM H rH Hamiltonian harmonic approximation harmonic crystal harmonic lattice harmonic model higher densities interactions interparticle potentials lattice Lennard-Jones harmonic Lennard-Jones potential lk lk longitudinal matrix elements Mbar molar volume molecular molecules moments Monte Carlo methods Morse potential nearest neighbor shells obtained ortho particle phonon Phys potential energy quantum crystals rH rH rH rH St rms displacement solid helium specific heat spectrum st CM St rH St St Table trial wave function variational parameters wave function wavefunction zero point energy zero temperature