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  • 1
    Electronic Resource
    Electronic Resource
    Probing femtosecond solvation dynamics at the condensed phase-vacuum interface (1992)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 96 (1992), S. 2795-2800 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100186a004
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Intense surface photoemission: Space charge effects and self-acceleration (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 68 (1990), S. 4802-4810 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Ultraviolet laser irradiation of surfaces, in the course of photoemission or surface photochemical studies, often produce copious electron emission, up to 1000's of A/cm2. The time-dependent fields produced by these electrons accelerate some of the electrons up to 5.4 times their initial energies. The steady-state fields return most of the emitted electrons to the surface. We discuss and illustrate both phenomena with theoretical simulations and experiment, and discuss possible implications.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.346137
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Electron transmission through layers of H2O and Xe in the ultrahigh vacuum photoreduction of CH3Cl on Ni(111) (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 91 (1989), S. 1937-1938 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The photoreduction of CH3Cl was used to detect the transmission of electrons through layers of H2O and Xe on Ni(111) under ultrahigh vacuum (UHV) conditions. At a laser wavelength of 248 nm with H2O spacers, the electron intensity exhibited a nearly exponential decay to zero signal with the 1/e point at about 2 monolayers. At 193 nm with H2O spacers, the signal decayed with the 1/e point at about 4 monolayers to a constant value due to the direct photofragmentation of the CH3 Cl possible at this wavelength. At 248 nm with Xe spacers, the signal decayed by a factor of 4 in the first 2 monolayers, after which the signal was nearly constant and nonzero for at least 64 monolayers, indicating a long electron mean free path. CH3Br is shown to behave similarly with H2 O spacers at 248 nm.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.457048
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Notch filter and fast current amplifier for use with time-resolved quadrupole mass spectrometers (1989)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 60 (1989), S. 3070-3071 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Insertion of an LC single-stage notch filter (of the shunt variety) between the output of a quadrupole mass spectrometer and a fast current amplifier greatly attenuates the rf noise typically present on the signal output. The 2.5-MHz rf was significantly reduced with negligible interference of the 1-μs resolved time of flight (TOF) work. Also presented is the fast current amplifier design.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1141078
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  • 5
    Electronic Resource
    Electronic Resource
    Corrected electrostatic model for dipoles adsorbed on a metal surface (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 101 (1994), S. 8138-8151 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We present a dipole–dipole interaction model for polar molecules vertically adsorbed on a idealized metal surface in an approximate analytic form suitable for estimating the coverage dependence of the work function, binding energies, and thermal desorption activation energies. In contrast to previous treatments, we have included all contributions to the interaction energy within the dipole model, such as the internal polarization energy and the coverage dependence of the self-image interaction with the metal. We show that these can contribute significantly to the total interaction energy. We present formulae for both point and extended dipole cases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.468241
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  • 6
    Electronic Resource
    Electronic Resource
    Laser photofragmentation and photodesorption of physisorbed CH3Br on lithium fluoride (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 86 (1987), S. 738-744 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Laser irradiation at 193 nm of multilayer of CH3Br physisorbed on LiF at 30 K leads to both photofragmentation and photodesorption of molecules. One-photon photofragmentation was observed leading to broad velocity distributions for ejected CH3 and Br. Fragments as fast as those found in gas-phase photofragmentation were seen as well as collisionally slowed fragments. High energy (2 eV, four times the gas-phase kinetic energy) Br fragments were also observed due to collisions with rebounding CH3. Collisionally ejected molecules were also seen. A small fraction of molecules desorbed via a thermal process, associated perhaps with small amounts of adsorbed particulate contaminants. This mechanism may be responsible for some of the molecular desorption seen by other groups. Thermal desorption studies show that CH3Br (or CO2, Xe, or H2O) does not wet LiF, indicating a general trend important to all alkali–halide overlayer studies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.452276
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Mechanism and speed of initial step of oxygen chemisorption-O2 on W (1977)
    Springer
    Applied physics 14 (1977), S. 411-413 
    Details
    ISSN: 1432-0630
    Keywords: 82.65
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract A direct first step in the mechanism for the initial oxidation of a polycrystalline tungsten surface, the catalyzed dissociation of O2 on it, or the formation of WO X by O2 at intermediate temperatures is shown to occur in ∼10−13 s. Molecular beam experiments demonstrated that the reactivity was greater than 90%, the unreacted O2 was substantially unaccommodated in translational energy to the surface temperature, and the reaction probability was nearly independent of surface temperature from 2800 to 415 K although there was a small increase at 415 K. The general conditions when no molecular surface precursor state contributes to the surface reactivity are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00883448
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    Paper (German National Licenses)
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