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  • 1985-1989  (3)
Material
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 90 (1989), S. 762-767 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Nonrelativistic, relativistic, and semiempirical pseudopotentials for the Pb atom have been generated to replace the chemically inert core electrons for investigating the effects of relativity and correlation on molecular properties of PbH+, PbH, PbH2, and PbH4. Spin–orbit effects are taken into account by using a quasirelativistic two-spinor pseudopotential. The relativistic bond contraction is found to be dependent on the Pb(6s) orbital participation in the Pb–H bond (Δrelre : 0.04 A(ring) for PbH+, PbH, and PbH2 and 0.07 A(ring) for PbH4). The calculated and measured values agree excellently [e.g., re (PbH)=1.839 A(ring); expt. 1.839 A(ring)]. The inert pair effect for the lead hydrides will be discussed.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 84 (1986), S. 1606-1612 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Pseudopotentials are used for investigating the effects of relativity and correlation on atomic properties of Br and I, and on bond lengths and dissociation energies of the molecules HBr, HI, Br2, and I2. The pseudopotentials are adjusted to energies of Br6+ and I6+ on different levels of approximation: (i) to Hartree–Fock data for the nonrelativistic case, (ii) to Dirac–Fock data for the relativistic case, and (iii) to experimental energies for the relativistic case including correlation. At the highest level of approximation, atomic ionization energies, electron affinities, molecular dissociation energies, and bond lengths are obtained in good agreement with the experimental results.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 59 (1985), S. 143-149 
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Bremsstrahlung isochromats of polycrystalline TiC, ZrC, HfC, VC, NbC, and TaC have been measured at a monochromator energy of 1,008.2 eV. The curves are similar to those of the pure metals, but show a secondary structure caused by the chemical binding of metal and carbon. The experimental results are compared with density-of-states calculations. Together with XPS-measurements, they allow to derive the widths of the total conduction bands of the carbides, which are compared with thed-band widths of the pure metals and with band structure calculations.
    Type of Medium: Electronic Resource
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