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  • 1
    Electronic Resource
    Electronic Resource
    Electron impact spectroscopy of silane and germanef a@f ) (1985)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 82 (1985), S. 2909-2917 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Electron impact spectra of silane and germane have been recorded using electrons of 200 eV incidence at scattering angles of ∼2°–9°. The range of energy losses covers the entire region of single electron excitation from the valence shell. In the bound state spectrum evidence is presented supporting the existence of two valence transitions in addition to anticipated s, p, and d Rydberg transitions. The 9° spectra reveal much structural detail in the ∼4 eV energy range preceding the 2A1 ion state. The most prominent band consists of a superposition of an optically allowed valence excitation and a symmetry forbidden Rydberg transition. The remaining peaks may be members of vibrational progressions belonging to either [d(t2), a1], [p, a1] ← (a1)2 dipole allowed or [d(e), a1], [s,a1] ← (a1)2 dipole forbidden channels. Of these two possibilities the evidence presented here favors the latter choice.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.448238
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  • 2
    Electronic Resource
    Electronic Resource
    Investigation of orbital momentum profiles of methylpropane (isobutane) by binary (e,2e) spectroscopy (2001)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 114 (2001), S. 882-888 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Momentum profiles of the valence orbitals of methylpropane, also known as isobutane (CH3CH(CH3)CH3), have been studied by using a high resolution binary (e,2e) electron momentum spectrometer (EMS), at an impact energy of 1200 eV plus the binding energy, and using symmetric noncoplanar kinematics. The coincidence energy resolution of the EMS spectrometer is 0.95 eV full width at half-maximum. The experimental momentum profiles of the valence orbitals are compared with the theoretical momentum distributions calculated using Hartree–Fock (HF) and density functional theory (DFT) methods with the two basis sets of 6-31G and 6-311++G**. The B3LYP functionals are used for the DFT calculations. In general, the experimental momentum distributions are well described by the HF and DFT calculations. The pole strengths of the main ionization peaks from the orbitals in the inner valence are estimated. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1321313
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  • 3
    Electronic Resource
    Electronic Resource
    Application of a Drude model to the binding of excess electrons to water clusters (2002)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 116 (2002), S. 6973-6981 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A one-electron model potential approach for calculating the binding energies of an excess electron interacting with water clusters is presented. Drude oscillators are employed on the water monomers to describe electron–water polarization and dispersion interactions. It is demonstrated that the resulting model gives electron binding energies very close to the predictions of ab initio CCSD(T) calculations. Dispersion interactions and high-order renormalization effects are found to make large contributions to the electron binding energies. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1461811
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  • 4
    Electronic Resource
    Electronic Resource
    A Drude-model approach to dispersion interactions in dipole-bound anions (2001)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 114 (2001), S. 10717-10724 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A one-electron model potential for calculating the binding energy of an excess electron interacting with polar molecules and their clusters is described. The unique feature of this potential is the treatment of polarization and dispersion effects by means of a Drude model. The approach is tested by calculating the energies for binding an excess electron to HCN, (HCN)2, HNC, and (HNC)2. The model potential results are found to be in good agreement with the predictions of high-level all-electron calculations. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1376630
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  • 5
    Electronic Resource
    Electronic Resource
    Measurement of collision-induced shift and broadening of the ultraviolet transitions of OH (1985)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 82 (1985), S. 2877-2879 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Using a cw tunable laser, absorption measurements were made to determine for the first time the shift and broadening of the ultraviolet transitions of OH induced by collisions with molecular nitrogen and oxygen. Similar measurements were also made for collisions with air and inert gases He, Ne, Ar, and Kr. Both the shift and broadening due to these collisions were found to depend linearly upon pressures in the range from 50 Torr up to 1 atm. The homogeneous linewidth for the P1(2) transition of OH in ambient air is determined to be (0.20±0.005) cm−1. Results with Ar and Kr show contributions not accounted for by the polarizability of the colliding species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.448234
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  • 6
    Electronic Resource
    Electronic Resource
    Preparation and electrical properties of polymeric TCNQ and TCNE films by plasma polymerization (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 1476-1483 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The plasma polymerization of TCNQ (tetracyanoquinodimethane) and TCNE (tetracyanoethylene) was carried out at 13.56 MHz from the gas phase and semiconductive polymeric films were obtained. The electrical conductivities of the films obtained ranged from 10−10 to 10−6 S cm−1 and the Al/polymer/ITO (indium tin oxide) sandwich cells made from the films showed rectifying behavior and photovoltaic response. Photoconductivity was also observed in the films. Infrared spectroscopy, ultraviolet spectroscopy, and x-ray photoelectron spectroscopy were utilized to characterize the structure, and these results as well as those from electrical measurements confirmed that a certain conjugation structure when the π electrons delocalized have been formed in the films. The influence of plasma polymerization conditions on the structure and electrical properties of films is also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.341821
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  • 7
    Electronic Resource
    Electronic Resource
    UHV deposition system for quench condensation and in situ study of amorphous transition metal alloy films (1987)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 58 (1987), S. 1271-1278 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: An UHV deposition system for the production of amorphous transition metal alloy films by quench condensation from the vapor phase onto substrates held at liquid-helium temperature is described. The system can be operated with either of two helium cryostats which are designed for different in situ experiments. One of the cryostats incorporates a superconducting solenoid for superconducting critical field, Hall effect, and magnetoresistance measurements from 1.4 to 300 K in fields to 7 T. The other, which provides a larger working space, can be used for a variety of in situ experiments (a rapid survey of the properties of amorphous alloys as a function of concentration, thin-film heat capacity measurements, or superconducting tunneling experiments) between 1.4 and 300 K. Critical field and Hall coefficient measurements for amorphous Ti–V alloys and tunneling results for amorphous gallium films are presented to illustrate the system capabilities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1139452
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  • 8
    Electronic Resource
    Electronic Resource
    Composition fluctuation induced depolarized Rayleigh scattering from diblock copolymer melts (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 100 (1994), S. 3286-3296 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Dynamic light scattering in the depolarized geometry has been used to investigate the pretransitional behavior of diblock copolymer melts near the order–disorder transition (ODT). Besides the segmental orientational dynamics, an additional slow relaxation process contributes to the dynamic depolarized intensity. This new relaxation mode exhibits an almost exponential shape, a wave vector (q) independent relaxation rate, and a strongly temperature dependent amplitude that compares with the temperature dependence of the maximum of the static structure factor at q*, measured with small-angle x-ray scattering. An account for the characteristics of this new relaxation process is based on the coupling between orientation and order parameter fluctuations. The depolarized intensity is due to orientation and/or extension of the copolymer chains in the pretransitional state above the ODT, with the relevant length scale of the slow orientation fluctuations being close to 2π/q*.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.466419
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  • 9
    Electronic Resource
    Electronic Resource
    Magnetoresistivity below Tc in silver-clad Bi1.8Pb0.4Sr2Ca2Cu3Oy tape (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 77 (1995), S. 2613-2617 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have measured the magnetoresistance curves of a silver-clad Bi (2223) tape below critical temperature Tc over a magnetic field range up to 8 T. At temperatures well below Tc the magnetoresistive transition can be well described by a thermally activated flux flow (TAFF) process. The activation energies inferred from such dissipation measurements are found to have the form U=U0+U' (H,T), where U0 is magnetic field and temperature independent, U' (H,T) is proportional to (1−T/Tc)n/H. At temperatures very close to Tc the TAFF dissipation can no longer be found and the magnetoresistance seems to be determined by the combination of viscous flux flow and thermal fluctuation. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358725
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  • 10
    Electronic Resource
    Electronic Resource
    YBaCuO superconducting thin films with zero resistance at 84 K by multilayer deposition (1987)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 51 (1987), S. 946-947 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: YBaCuO superconducting thin films were prepared by multilayer deposition on different kinds of substrates. High Tc with an onset of 94 K and a zero resistance at 84 K has been obtained by deposition on pure ZrO2 substrates. The nature of zero resistance as well as the dR/dT characteristic above Tc and the influence of substrates are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.98810
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