The change in work function due to adsorption is measured using retarding potential method and ultrahigh vacuum techniques. The work function of clean gold increases by 0.68±0.05 eV due to water adsorption. Effect of mercury adsorption on gold and silver is to decrease the work function by 0.16±0.03 and 0.20±0.03 eV respectively. During desorption mercury reacts with the clean surface of gold and silver and the resultant decrease up to 0.66 and 0.38 eV is observed. For Mo and Re, Hg adsorption increases the work function by 0.28±0.03 and 0.13±0.01 eV and during desorption decreases the work function by 0.32 and 0.26 eV respectively.
Assuming metallic lithium as an array of ions embedded in a sea of electrons and also the adiabatic approximation, we calculate the electronic contributions to the potential energy of the lattice by using modified Hartree-Fock equations and nonlocal pseudopotential techniques under various conditions {orthogonalization charge considered fully, partially only in the matrix element, and neglected completely) self-consistently. The electron-phonon interaction, cohesive energy, and lattice stability are discussed. Assuming that all entropy terms in the free energy come from the phonons, calculations for the Debye 80, zero-point energy, lattice parameters, and variation of free energy with respect to temperature for the three phases bcc, fcc, and hcp of lithium are made. The martensitic transformation temperature T, has been evaluated for the above three phases. Importance of exchange term with respect to above properties are also discussed. 8-T curves and phonon dispersion relations have been plotted for the three phases.
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