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  • 1
    Electronic Resource
    Electronic Resource
    Molecular beam electric deflection study of the hydrogen-bonded water, methanol, and ethanol clusters (H2O)N, (CH3OH)N, and (C2H5OH)N (1985)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 89 (1985), S. 4867-4868 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100268a041
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  • 2
    Electronic Resource
    Electronic Resource
    Rotationally inelastic gas–surface scattering: HCl from Au(111) (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 92 (1990), S. 2614-2623 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A quantum-resolved molecular beam–surface scattering study of HCl scattered from Au(111) is described. The HCl is detected in a quantum-resolved manner via (2+1) resonant enhanced multiphoton ionization (REMPI). Greater than 85% of the incident HCl molecules are in a single-quantum state (v=0, J=0) with a narrow velocity distribution (Δυ/υ〈0.10). The scattered HCl is strongly peaked about the specular angle, and both its final velocity and rotational distributions are indicative of direct inelastic scattering. The scattered rotational distributions exhibit features characteristic of rotational rainbows and have a mean rotational energy that displays a bilinear dependence upon the incident normal kinetic energy and surface temperature. The final velocity distributions are largely insensitive to the rotational level and indicate that the energy loss to phonons is small (〈20%). Analysis of the scattered data indicates an orientation-averaged attractive well depth of ∼5 kcal/mol for the HCl–Au(111) interaction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.457955
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  • 3
    Electronic Resource
    Electronic Resource
    The influence of adsorbate–absorbate hydrogen bonding in molecular chemisorption: NH3, HF, and H2O on Au(111) (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 91 (1989), S. 5120-5121 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Molecular beam and temperature programmed desorption (TPD) techniques are used to study the low temperature (85 K) adsorption and subsequent thermal desorption of NH3, HF, and H2O from Au(111). At 85 K the molecular sticking coefficients are near unity and are coverage independent. The TPD spectra are qualitatively different for the various species. Simple hydrogen bonding arguments based on absorbate–absorbate interactions are used to explain the differences in the TPD spectra.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.457606
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  • 4
    Electronic Resource
    Electronic Resource
    Quasiclassical trajectory study of rotational energy transfer in the scattering of NH3 from a flat, rigid gold surface (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 89 (1988), S. 551-561 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Quasiclassical trajectories are used to study rotational energy transfer in the collision of a rigid-rotor NH3 molecule with a flat, rigid gold surface. The anisotropic term in the long-range attractive potential causes the NH3 to preferentially reorient with its dipole moment normal to the surface plane as it approaches the surface. This reorientation decreases the rotational energy transfer and gives rise to a sharp rotational rainbow at zero rotational energy. Trajectory results predict that the molecule preferentially scatters into low K states (tumbling) rather than the J=K states (spinning). This prediction is in qualitative agreement with recent molecular beam/surface scattering experiments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.455444
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  • 5
    Electronic Resource
    Electronic Resource
    Two-photon spectroscopy of N2: Multiphoton ionization, laser-induced fluorescence, and direct absorption via the a‘ 1Σ+g state (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 95 (1991), S. 2252-2258 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A new (2+1) resonantly enhanced multiphoton ionization (REMPI) process via the a‘ 1Σ+g state of N2 with a quantum specific detection sensitivity of ∼105 molecule cm−3 is reported. The resulting spectra are easily analyzed and yield directly the relative rotational and vibrational populations in the ground electronic state of N2. Additionally, both two-photon direct absorption (TPDA) to, and laser-induced fluorescence (LIF) from two-photon excitation of, the a‘ state of N2 are observed. These spectroscopies are compared with (2+1) REMPI and TPDA via the E,F state of H2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.460981
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  • 6
    Electronic Resource
    Electronic Resource
    Rotationally inelastic scattering of N2 from clean and hydrogen covered Pd(111) (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 90 (1989), S. 7602-7603 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Quantum-resolved molecular beam–surface scattering from clean and hydrogen covered Pd(111) is shown to be a sensitive dynamical probe of changes in the gas–surface interaction potential brought about by the presence of chemisorbed surface hydrogen. In particular, the specular scattering of N2 from hydrogen covered Pd(111) is appreciably less inelastic rotationally than scattering from the clean surface. The specularly scattered rotationally elastic channel is utilized as a nonperturbative probe of the surface chemisorbed hydrogen coverage during a temperature programmed desorption (TPD) experiment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.456678
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  • 7
    Electronic Resource
    Electronic Resource
    Decomposition of trimethylgallium on the gallium-rich GaAs (100) surface: Implications for atomic layer epitaxy (1990)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 57 (1990), S. 279-281 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The decomposition of trimethylgallium (TMGa) on the gallium-rich (4×6) and (1×6) GaAs (100) surface was studied with temperature programmed desorption, Auger electron spectroscopy, and low-energy electron diffraction. TMGa was found to dissociatively chemisorb on the gallium-rich surfaces, apparently at the gallium vacancies that exist on these surfaces. We have unambiguously identified methyl radicals desorbing from the surface with the maximum rate at ∼440 °C following a saturation TMGa exposure. Since TMGa was shown to decompose on the clean, gallium-rich GaAs (100) surfaces, the self-limiting deposition of gallium during atomic layer epitaxy must be due to the presence of surface methyl groups which inhibit further TMGa dissociative chemisorption.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.103714
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  • 8
    Electronic Resource
    Electronic Resource
    Time-of-flight characterization of pulsed supersonic helium free-jet expansions (1986)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 57 (1986), S. 2266-2273 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A synchronous time-of-flight (TOF) technique is employed to make velocity distribution measurements in pulsed supersonic free-jet expansions. For helium expansions, the flow attains a steady–state condition with a terminal Mach number of 80, on a 50-μs time scale. The transient behavior is primarily due to the mechanical action of the valve. For a 650-μs-wide pulse, greater than 95% of the atoms issuing from the pulsed nozzle can be described by the steady-state parameters. However, the velocity dispersion increases at both the leading and trailing edges of the pulse. This dispersion can be quantitatively described by incorporating a time-dependent Mach number into the standard steady-state flux velocity distribution function.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1138695
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  • 9
    Electronic Resource
    Electronic Resource
    Quantum mechanical study of H(g)+Cl–Au(111): Eley–Rideal mechanism (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 100 (1994), S. 7687-7695 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Beams of atomic hydrogen are known to react with halogens adsorbed on metal surfaces, and an Eley–Rideal mechanism has been suggested. The collinear reaction of gas phase H with Cl atoms adsorbed on an Au(111) surface is explored using time dependent quantum techniques. Probabilities for reaction and reflection are computed as a function of incident H energy and Cl–metal vibrational state. The time evolution is examined and a long lived intermediate is found to exist in which the Cl is bound to both the H and the metal. The probability for Eley–Rideal reaction is found to be small, on the order of a few to several percent, due primarily to the mass mismatch. The vibrational distribution of the product HCl and the temperature dependence of the reaction probability are in agreement with experiment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.466862
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  • 10
    Electronic Resource
    Electronic Resource
    The adsorption and desorption of water on single crystal MgO(100): The role of surface defects (1996)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 105 (1996), S. 1295-1298 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Adsorption and desorption of water on well-ordered and sputter-damaged single crystal MgO(100) surfaces were studied by a combination of molecular beam reflection and temperature programmed desorption techniques. Adsorption exhibits precursor-mediated kinetics and desorption exhibits a strong dependence on substrate treatment, demonstrating the importance of surface defects. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.471993
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