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  • 1
    Electronic Resource
    Electronic Resource
    Growth of highly doped p-type ZnTe films by pulsed laser ablation in molecular nitrogen (1995)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 67 (1995), S. 2545-2547 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Highly N-doped (mid-1019 to (approximately-greater-than)1020 cm−3) ZnTe/(001)GaAs epitaxial films have been grown by pulsed laser ablation (PLA) of a stoichiometric ZnTe target in a high-purity N2 ambient (50 to 200 mTorr) without the use of any assisting dc or ac plasma source. Unlike recent experiments in which atomic N, extracted from dc and rf plasma sources, was used to produce N-doping during molecular beam epitaxy, spectroscopic measurements performed during PLA of ZnTe in N2 do not reveal the presence of atomic N. This suggests that the high hole concentrations in laser ablated ZnTe are produced by a new mechanism, possibly energetic beam-induced reactions with excited N2 adsorbed on the film surface, and/or transient formation of Zn–N complexes in the energetic ablation plume. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.114453
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  • 2
    Electronic Resource
    Electronic Resource
    Study of the visible emission induced by IR multiple-photon excitation of OsO4 (1986)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 84 (1986), S. 2020-2034 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The visible luminescence induced in the OsO4 molecule by the action of CO2-laser radiation was studied in a wide range of laser fluences (2–1000 J/cm2). A novel approach consisting in separating successive dissociation and fluence was developed experimentally to study the visible emission induced by multiple-photon excitation (MPE) in an IR-laser field. Three different luminescence stages with definite fluence thresholds were found in MPE of the OsO4 molecule. The luminescence spectra and the velocities of the luminescent species were measured at each stage. A theoretical model is proposed which explains the observed three-stage emission in OsO4 by the following sequence of processes taking place during the IR-laser pulse: inverse electronic relaxation (IER)–multiple-photon dissociation (MPD) of the parent molecule (OsO4–first stage)—IER–MPD of the primary fragment (OsO3-second stage)—IER–MPD of the secondary fragment (OsO2-third stage).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.450410
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  • 3
    Electronic Resource
    Electronic Resource
    Modeling of plume dynamics in laser ablation processes for thin film deposition of materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 3 (1996), S. 2203-2209 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The transport dynamics of laser-ablated neutral/plasma plumes are of significant interest for film growth by pulsed-laser deposition of materials, since the magnitude and kinetic energy of the species arriving at the deposition substrate are key processing parameters. Dynamical calculations of plume propagation in vacuum and in background gas have been performed using particle-in-cell hydrodynamics, continuum gasdynamics, and scattering models. Results from these calculations are presented and compared with experimental observations. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.871676
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  • 4
    Electronic Resource
    Electronic Resource
    Multiphoton ionization/dissociation of osmium tetroxide (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 98 (1993), S. 951-958 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The mechanisms leading to laser multiphoton ionization and dissociation (MPI/MPD) of osmium tetroxide (OsO4) have been investigated from measurements of the kinetic energies of product ions (Os+, Os2+, OsO+, O2+, O+) and photoelectrons as a function of the laser wavelength. Neutral channels, intermediate to the dominant Os+ ionization channel, such as OsO4→OsO4−n+nO are examined using resonance-enhanced multiphoton ionization (REMPI) of the fast O atoms. Equipartition of the available photon energy among the fragments is observed. The wavelength dependence of the Os+ ion signal suggests that one or more of the steps leading to Os+ ions involve molecular ions and/or excited neutral atoms. The observed preponderance of very slow (〈0.2 eV) electrons also supports this interpretation. Os2+ is shown to result primarily from REMPI of Os+.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.464258
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  • 5
    Electronic Resource
    Electronic Resource
    Gas-phase nanoparticle formation and transport during pulsed laser deposition of Y1Ba2Cu3O7−d (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 74 (1999), S. 3788-3790 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The gas-phase growth and transport of nanoparticles are characterized at the low background oxygen pressures used for pulsed laser deposition of high-Tc Y1Ba2Cu3O7−d superconducting films. Onset times and pressures for gas-phase nanoparticle formation were determined by intensified charge-coupled device imaging and optical spectroscopy of laser-induced fluorescence from diatomic oxides and Rayleigh scattering from gas-suspended nanoparticles. Nanoparticles are detected for oxygen pressures above 175 mTorr at room temperature, with growth continuing during seconds within the cloud of stopped vapor near the heater surface. Elevated heater temperatures create background density gradients which result in reduced resistance to the initial plume expansion. The temperature gradient also moves nanoparticles away from the heater surface as they grow, effectively limiting the time and spatial confinement necessary for continued growth or aggregation, and inhibiting deposition by thermophoresis. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.124180
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  • 6
    Electronic Resource
    Electronic Resource
    Structure and optical properties of amorphous diamond films prepared by ArF laser ablation as a function of carbon ion kinetic energy (1998)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 73 (1998), S. 2591-2593 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Amorphous carbon films with variable sp3 content were produced by ArF (193 nm) pulsed laser deposition. Electron energy loss spectroscopy and spectroscopic ellipsometry were employed to systematically study changes in the bonding and optical properties of the carbon films as a function of the kinetic energy of ablated C ions, which was measured using an ion probe. The measurements reveal that the films with the most diamond-like properties are obtained at the C ion kinetic energy of ∼90 eV. In contrast to measurements made as a function of laser fluence, ion probe measurements of kinetic energy are a convenient as well as more accurate and fundamental method for monitoring deposition conditions, with the advantage of being readily transferable for interlaboratory comparisons. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.122515
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  • 7
    Electronic Resource
    Electronic Resource
    In situ imaging and spectroscopy of single-wall carbon nanotube synthesis by laser vaporization (2000)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 76 (2000), S. 182-184 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The synthesis of single-wall carbon nanotubes by Nd:YAG laser vaporization of a graphite/(Ni, Co) target is investigated by laser-induced luminescence imaging and spectroscopy of Co atoms, C2 and C3 molecules, and clusters at 1000 °C in flowing 500 Torr Ar. These laser-induced emission images under typical synthesis conditions show that the plume of vaporized material is segregated and confined within a vortex ring which maintains a ∼1 cm3 volume for several seconds. Using time-resolved spectroscopy and spectroscopic imaging, the time for conversion of atomic and molecular species to clusters was measured for both carbon (200 μs) and cobalt (2 ms). This rapid conversion of carbon to nanoparticles, combined with transmission electron microscopy analysis of the collected deposits, indicate that nanotube growth occurs over several seconds in a plume of mixed nanoparticles. By adjusting the time spent by the plume within the high-temperature zone using these in situ diagnostics, single-walled nanotubes of controlled length were grown at an estimated rate of 0.2 μm/s. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.125696
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  • 8
    Electronic Resource
    Electronic Resource
    Time of flight spectroscopy of particles in electronically excited state, produced via infrared laser excitation (1980)
    Springer
    Applied physics 22 (1980), S. 77-81 
    Details
    ISSN: 1432-0630
    Keywords: 82.50 ; 33
    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 method for determination of the translational energy of the fragments in long living electronic states obtained under ir multiple-photon dissociation of the molecules is proposed. The measurement of the translational distribution function and of the average translational energy of the particles appeared under MPD of OsO4 has been carried out by this method. It has been shown that the proposed technique may be usefull for identification of visible radiation as belonging to the fragment or to the parent molecule itself.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00897936
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  • 9
    Electronic Resource
    Electronic Resource
    Comments on small superconducting clusters (1992)
    Springer
    Applied physics 54 (1992), S. 100-102 
    Details
    ISSN: 1432-0630
    Keywords: 71.10 ; 74.65
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The feasibility of an experimental study of small superconducting clusters (SC) is analyzed. Critical sizes for SC are calculated. Oscillations of the energy gap and the diamagnetic susceptibility of SC are considered.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00348139
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  • 10
    Electronic Resource
    Electronic Resource
    Direct measurement of multiphoton molecular absorption of IR laser radiation by pyroelectric detector (1980)
    Springer
    Applied physics 22 (1980), S. 409-413 
    Details
    ISSN: 1432-0630
    Keywords: 82.50 ; 33
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The applicability of a pyroelectric detector (PED) to multiphoton absorption measurements (MPA) under ir laser excitation of molecules was examined. The possibility of MPA measurement of SF6 molecules in the pressure range of 10−3÷10−1 Torr with a time resolution of ∼ 7 μs has been shown. It has been demonstrated that the degree of vibrational relaxation of highly vibrationally excited molecules at PED surface does not depend on excitation level under the studied conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00901066
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