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  • 1
    Electronic Resource
    Electronic Resource
    On entropy generation in phase-change heat conduction (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 66 (1989), S. 4053-4061 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: This paper addresses the entropy production in heat conduction, accompanied by melting/solidification. The expressions for the time derivative of the entropy and the excess entropy production in selected Stefan problems are derived. These physical quantities are shown to be meaningful evolution characteristics for several phase-change processes that evolve towards equilibrium or self-similar asymptotic attractors. Prigogine's theorem of minimal steady-state entropy production is shown to be invalid for the phase-change heat conduction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.343989
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  • 2
    Electronic Resource
    Electronic Resource
    Initial epitaxial growth of copper silicide on Si{111} studied by low-energy electron microscopy and photoemission electron microscopy (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 65 (1989), S. 4747-4752 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The epitaxial growth, including submonolayer epitaxial growth, of Cu silicide on Si{111} of standard wafer thickness is studied in situ by low-energy electron microscopy and photoemission electron microscopy. At elevated temperatures up to about 850 K copper silicide grows as a two-dimensional (2D) layer with a "(5×5)'' structure followed by epitaxy of three-dimensional (3D) Cu3Si crystals. Atomic steps initially present on the wafer surface bunch into groups of 2 and 3 and facet along the Si〈110〉 directions. Except for steps, monolayer silicide films appear defect- and pinhole-free down to the resolution limit. Films grown by depositing Cu onto substrates held at room temperature followed by annealing differ in morphology and have 500 times the number of 3D islands as do films grown at the annealing temperature. Above 850 K the Cu dissolves into the bulk. Upon cooling Cu segregates to the surface as a 2D silicide with a "(5×5)'' structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.343227
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  • 3
    Electronic Resource
    Electronic Resource
    Low frequency modes of surface adsorbed dye molecules studied by optical high resolution techniques (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 91 (1989), S. 1944-1945 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We observed for the first time in an optical high resolution experiment (fluorescence line narrowing) the coupling of low frequency adsorbate motions to vibronic bands of the electronic transition of quinizarin adsorbed on γ-alumina. These motions may provide an important dephasing mechanism for the electronic excitation of absorbed molecules. The increased hole width of adsorbed dyes which is several times larger than in amorphous hosts is thought to be caused by these low frequency modes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.457052
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  • 4
    Electronic Resource
    Electronic Resource
    Two-photon spectroscopy of Rydberg states of NO (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 90 (1989), S. 5971-5981 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Two-photon spectroscopy of supersonically cooled NO in the region between the NO+ X 1Σ+, v+=0 and 1 ionization thresholds reveals the n=7–12 members of the ndπ−, v=1 Rydberg series. The n=5 member of the same series is observed below the two-photon ionization threshold by using two-photon resonant, three-photon ionization. The data are analyzed by using multichannel quantum defect theory to extract rotationless quantum defects and to reveal perturbation by the nf, v=1 series. Theoretical two-photon rotational line strengths are in satisfactory agreement with the observed data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.456363
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  • 5
    Electronic Resource
    Electronic Resource
    Laser spectroscopical investigation of atomic sodium kept at defined distances from Au(111) single crystal surfaces via Langmuir–Blodgett films (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 90 (1989), S. 6805-6807 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.456301
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  • 6
    Electronic Resource
    Electronic Resource
    Formation and stability of a complex of positronium with nitrobenzene from the study of the magnetic field effects (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 91 (1989), S. 1579-1584 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The magnetic quenching of the triplet state of positronium (o-Ps) has been studied in pure n-hexane at 294 K, by applying an external magnetic field. The measured annihilation parameters are characteristic of a normal second-order Zeeman effect and betray some slight expansion of the Ps wave function as compared to in vacuo. In the presence of nitrobenzene, which reacts with Ps to form a complex, very strong effects are observed, confirming previous experiments. The lifetime of the o-Ps (m=0) substate undergoes a drastic decrease, even at very low magnetic field strengths. A new approach to this unexpected phenomenon is proposed, involving the reversible formation of a weak complex between Ps and the solute. Various quantitative treatments are attempted to fit the data. As it seems, the data can only be described if one supposes that there is no spin reorientation during the reaction. In all cases, the derived fitting parameters are characteristic of the complex, therefore denoting that the field effect does not intrinsically depend on solute concentration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.457116
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  • 7
    Electronic Resource
    Electronic Resource
    High orbital angular momentum states in H2 and D2. II. The 6h–5g and 6g–5f transitions (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 91 (1989), S. 3926-3933 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A group of lines accompanying the first line of the Pfund series of the H atom has been observed by Fourier transform infrared spectrometry. The lines are due to transitions in molecular hydrogen of a nonpenetrating Rydberg electron possessing a high-orbital angular momentum, which is coupled only loosely to the vibrations and rotations of the H+2 core. Lines belonging to the 6h–5g and 6g–5f (v=0–3) transitions of H2 have been identified. The identifications are based on a calculation of the spectrum from first principles by multichannel quantum defect theory. The interaction between the nonpenetrating electron and the core was evaluated in terms of the permanent and induced molecular moments of H+2 as calculated by Bishop and collaborators. The analogous transitions in D2 have also been observed and assigned.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.456824
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  • 8
    Electronic Resource
    Electronic Resource
    Temperature fluctuations and transport in a tokamak edge plasma (1989)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 1 (1989), S. 2027-2030 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Using the technique first described by Robinson and Rusbridge [Plasma Phys. 11, 73 (1969)] electron temperature fluctuations have been measured in the scrape-off layer of the TEXT tokamak [Nucl. Technol. Fusion 1, 479 (1981)] to be T˜e/Te (approximately-equal-to)0.4ñe/ne. Particle and energy transport were estimated from 〈ñe E˜θ〉 and 〈T˜e E˜θ〉 correlations. The fluctuation-driven particle transport was consistent with earlier measurements and with measurements of global particle confinement. A high correlation of temperature and electric field fluctuations and a low but positive correlation between density and temperature fluctuations were observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.859066
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  • 9
    Electronic Resource
    Electronic Resource
    Experimental measurement of three-wave coupling and energy cascading (1989)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 1 (1989), S. 153-163 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The nonlinear coupling coefficient and the energy transfer associated with three-wave interactions are computed from measured data of the turbulent edge plasma of the Texas Experimental Tokamak(TEXT) [Nucl. Technol. Fusion 1, 479 (1981)]. The results show the presence of three-wave interactions. The interactions cause energy to cascade away from the dominant waves of the spectrum primarily toward lower, but also toward higher frequencies. The results are obtained with a new digital spectral analysis technique based on the estimation of higher-order cumulants. The method is discussed and tested on a simulation experiment. The same technique is useful for neutral fluids as well.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.859082
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  • 10
    Electronic Resource
    Electronic Resource
    Highly sensitive automated setup for measuring surface photovoltage spectra (1989)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 60 (1989), S. 746-748 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We present an automated experimental setup for dc measurement of surface photovoltage (SPV) spectra in wide spectral and/or temperature ranges. A Pt boss, sealed on a bimorphic piezoelement, has been used as a small area vibrating electrode and a programmable digital-to-analog convertor (DAC) as a source of compensation. In addition, a combination of automatic data acquisition and statistical analysis has been applied, thus ensuring reliability and stability of SPV measurements. Moreover, the automated setup provides a high sensitivity and objectivity of SPV investigations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1141012
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