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  • 1990-1994  (36)
  • 1
    Electronic Resource
    Electronic Resource
    Poly(methyl methacrylate) film dissolution and solvent diffusion coefficients: correlations determined using laser interferometry-fluorescence quenching and pulsed-gradient spin-echo NMR spectroscopy (1993)
    s.l. : American Chemical Society
    Macromolecules 26 (1993), S. 6397-6402 
    Details
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ma00076a015
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Reduction of interface phonon modes using metal-semiconductor heterostructures (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 2338-2342 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Based on a simplified analysis of perfectly conducting metals, it has been suggested qualitatively that establishing metal-semiconductor interfaces at the heterojunctions of polar semiconductor quantum wells introduces a set of boundary conditions that dramatically reduces or eliminates unwanted carrier energy loss caused by interactions with interface longitudinal-optical (LO) phonon modes. In this article, it is theoretically demonstrated that comparable reductions in LO phonon scattering strengths may be achieved for metal-semiconductor structures with metal having realistic conductivities and Thomas–Fermi screening lengths.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353139
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    YBa2Cu3O7−δ thin films and microstrip resonators on MgLaAl11O19 substrates (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 74 (1993), S. 2983-2985 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Superconducting YBa2Cu3O7−δ thin films with Tc=89.5 K were deposited on MgLaAl11O19 (11¯0) substrates by pulsed laser deposition. X-ray diffraction patterns indicate that the YBa2Cu3O7−δ films were epitaxial films, with the c axis perpendicular to the substrate surfaces. Microstrip resonators of YBa2Cu3O7−δ thin films deposited on MgLaAl11O19 substrates were fabricated. The loaded quality factor of the resonator was 1007 at 77 K and 4.28 GHz. As a new substrate for high Tc oxide superconducting films, MgLaAl11O19 substrates are especially suitable for superconducting-microwave applications.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.354611
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Investigation on the quantum well structure of a GaAs/Al0.3Ga0.7As superlattice grown on a misoriented substrate (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 68 (1990), S. 3795-3797 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We analyzed the Raman spectra and x-ray diffraction of two GaAs/Al0.3Ga0.7As superlattices grown by molecular-beam epitaxy on a 4 ° misoriented (001) GaAs substrate and an exactly (001)-oriented GaAs substrate respectively. From the frequency shifts of the longitudinal-optical- (LO) confined phonons in the Raman spectra and the variation in linewidths of both the LO-confined phonons and the satellite peaks in x-ray diffraction, we found that the 4 ° misorientation of the GaAs substrate from (001) toward [110] direction improves the interface quality of the superlattices.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.346283
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  • 5
    Electronic Resource
    Electronic Resource
    Photodissociation of intraadsorbate bonds at adsorbate-metal interfaces (1990)
    s.l. : American Chemical Society
    Accounts of chemical research 23 (1990), S. 327-332 
    Details
    ISSN: 1520-4898
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ar00178a002
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Hot carrier induced photodesorption dynamics of SO2 from Ag(111) (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 99 (1993), S. 10021-10033 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The photon-driven (2.5 to 6.4 eV) desorption of SO2 (coverages up to 2.7 monolayers) on Ag(111) has been studied by time-of-flight mass spectrometry in combination with temperature programmed desorption and Auger electron spectroscopy. The photodesorption yields per incident photon increase with photon energy. Consistent with substrate-mediated excitation, the mean translational energy 〈Etrans/2k〉 is constant (650 K) for photon energies between 3.5 and 6.4 eV, but decreases at longer wavelengths (480 K at 2.5 eV). The decrease is attributed to changes in the energy distribution of the hot substrate carriers responsible for desorption. The photodesorption yields vary with the initial coverage, the method of preparing the initial coverage, and the extent of photolysis. These variations are attributed, in part, to changes in the SO2 orientation on the surface. Even at 6.4 eV, where unimolecular photodissociation occurs in the gas phase and multilayer, there is no photodissociation in monolayers. This effect is attributed to strong substrate quenching.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.465506
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  • 7
    Electronic Resource
    Electronic Resource
    Surface photochemistry 15: On the role of substrate excitation (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 92 (1990), S. 2681-2682 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The rates of photodissociation and photodesorption of dioxygen adsorbed on Ag (110) under ultraviolet irradiation have been measured as a function of polarization at normal incidence. No dependence of the rate was found on the angle between the O2 bond axis and the electric vector of the incident light. This result supports a mechanism for surface photochemistry in which substrate excitation is the dominant process.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.457964
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Photochemical decomposition of AsH3 on GaAs(100) (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 97 (1992), S. 605-615 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Molecular AsH3, adsorbed on Ga-rich GaAs(100) at 115 K, dissociates readily upon uv irradiation with 193, 248, and 351 nm excimer laser light. In the initial photodissociation step one As–H bond cleaves, leaving all the AsH2, and a large fraction of the H, adsorbed to As. The AsH2 further photodissociates to give As–H and Ga–H. The final steps, photochemical removal of hydrogen from Ga–H and As–H, lead to As deposition. The photodissociation cross section decreases sharply with the extent of photolysis. The wavelength dependence, compared to the gas-phase absorption cross section, extends to much lower photon energies and indicates that substrate-mediated excitation dominates the observed chemistry. There are strong isotope effects in all the cross sections; these are related to mass-dependent substrate-mediated quenching of the excited states. Implications for photon-assisted organometallic chemical vapor deposition are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.463556
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    The role of direct and substrate excitation in ultraviolet photolysis of phosgene on Pt(111) (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 94 (1991), S. 1555-1563 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The photodissociation rate of phosgene (Cl2CO) adsorbed on Pt(111) has been measured as a function of photon energy at normal incidence and as a function of incident angle using p-polarized light. Compared to the gas phase, the wavelength dependence of the initial photolysis cross section on the surface is redshifted. The angular response to p-polarized light is wavelength dependent. Above 315 nm, the angular dependence correlates with calculated metal absorption. At 280 nm, the angular dependence is much too strong to be accounted for solely by substrate excitation. A combination of substrate and direct excitation is adequate. This is the first direct evidence, for monolayers on metals, that both direct and substrate excitation contribute to surface photochemistry but dominate at different wavelengths.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.460013
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  • 10
    Electronic Resource
    Electronic Resource
    Isotope effect in vibration-mediated ultraviolet photodesorption: A short-time-limit harmonic approximation (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 98 (1993), S. 3410-3414 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Excitation and de-excitation of the electronic states of an adsorbed molecule on a solid surface result in intramolecular vibrational excitation. The internal vibrational energy can couple to the adsorbate–substrate bond and lead to molecular desorption. In this mechanism, the isotope effect in molecular desorption is determined not by the mass ratio of the leaving particles, but by that in the internal coordinate. This process is modeled within the context of semiclassical wave packet dynamics, which, in the short-time-limit harmonic approximation, allows analytical solution. Results are obtained for the ammonia/GaAs(100) system and are compared with experimental observations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.465048
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    Paper (German National Licenses)
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