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  • 1
    Electronic Resource
    Electronic Resource
    Cross-beam pulsed laser deposition: General characteristic (2001)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 72 (2001), S. 2665-2672 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Physical background of the operation of the cross-beam pulsed laser deposition (CBPLD) is considered. In this modification of PLD, gas-dynamic interaction of two plasma plumes from separate targets is used for particulate elimination from the plasma flux to the substrate. The interaction of the plasma plumes by CBPLD in a vacuum was investigated with the help of ion collectors and optical spectroscopy. A minimal plasma number density in the intersection region necessary for an efficient plume interaction amounts to (approximate)1.4×1015 cm−3 in the geometry of the experiments. For the materials with relatively high evaporation rates, the plasma density in the plume intersection region is larger than this value during almost the entire plume existing time, and the ablated material can be effectively utilized for the deposition of films. CBPLD demonstrates a very good effectiveness of the particulate removal from the plasma flux, and it is reasonable to suggest that CBPLD is one of the most effective working methods for particulate suppression in PLD. The interaction of two plumes results in filtering out the most energetic ions and the slowest neutrals of the original plumes from the plasma flux to the substrate, in decrease of the average plasma particle energy, and in increase of the degree of ionization of plasma up to more than 100%. Mechanisms responsible for these effects are analyzed. An asymmetric CBPLD geometry is proposed that makes it possible to mix materials of different targets directly in the laser plasma with good control over film composition. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1372166
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  • 2
    Electronic Resource
    Electronic Resource
    The use of silver tips in scanning tunneling microscopy (1993)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 64 (1993), S. 2393-2394 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We propose to use silver tips for scanning tunneling microscopy (STM). Silver is the cheapest noble metal that is practically chemically inactive in the air environment. A simple reliable procedure of the tip preparation and resharpening is presented. The procedure is based on two-step electrochemical processing resulting in final tip curvature of less than 200 nm in radius as seen by an electron microscope. The tips show durability for at least a week of daily operation in an air STM.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1143892
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  • 3
    Electronic Resource
    Electronic Resource
    Studies of the change of a metallic surface microrelief as a result of multiple-pulse action of powerful UV laser pulses (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 58 (1985), S. 3909-3913 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The formation of specific structural patterns as a result of the repeated UV laser irradiation on various metallic samples (Ag, Al, Au, bronze, Cu, and Pb) is reported. The physical processes underlying the formation of more or less organized periodical structures in this case are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.335611
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  • 4
    Electronic Resource
    Electronic Resource
    Mapping of continuum and lattice models for describing the adsorption of an ideal chain anchored to a planar surface (2001)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 114 (2001), S. 5366-5375 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: An ideal polymer chain anchored to a planar surface is considered by using both lattice and continuum model approaches. A general equation relating the lattice and continuum model adsorption interaction parameters is derived in a consistent way by substituting the exact continuum solution for the free chain end distribution function into the lattice model boundary condition. This equation is not mathematically exact but provides excellent results. With the use of this relation the quantitative equivalence between lattice and continuum results was demonstrated for chains of both infinite and finite length and for all three regimes corresponding to attractive, repulsive and adsorption-threshold energy of polymer-surface interaction. The obtained equations are used to discuss the distribution functions describing the tail of an anchored macromolecule and its adsorbed parts. For the tail-related properties the results are independent of the microscopic details of the polymer chain and the adsorbing surface. One interesting result obtained in the vicinity of adsorption threshold point is a bimodal tail length distribution function, which manifests chain populations with either tail or loop dominance. The properties related to the number of surface contacts contain, apart from universal scaling terms, also a nonuniversal factor depending on microscopic details of polymer-surface interaction. We derived an equation for calculating this nonuniversal factor for different lattice models and demonstrated excellent agreement between the lattice results and the continuum model. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1346686
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  • 5
    Electronic Resource
    Electronic Resource
    Adsorbed chain-stretched coil: An unusual phase transition (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 98 (1993), S. 5961-5970 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: An exact expression is obtained for the partition function of a Gaussian chain of arbitrary length adsorbed on a plane with stretching force acting on the chain's free end. It is found that the increase in the stretching force makes the macromolecule undergo an unusual phase transition from the adsorbed state into a stretched chain state. In the thermodynamic limit, the free energy has a discontinuity in the slope at the transition point, the average number of chain segments contacting with the plane changes abruptly, and finite latent heat is absorbed. However, metastable states are completely absent and the dependence of the thermodynamic potential on the order parameter always has only one minimum. In the vicinity of the transition point, the anomalous slowing down of large scale relaxation takes place. Thus the transition under consideration has simultaneously some features of both first- and second-order phase transitions. Behavior of the finite systems under the transition is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.464855
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  • 6
    Electronic Resource
    Electronic Resource
    Lateral self-limitation in the laser-induced oxidation of ultrathin metal films (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 69 (1996), S. 2816-2818 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: cw-laser-induced local oxidation of ultrathin (3–60 nm) titanium films on glass in air is studied. It is shown, that the brightening of the films upon through-oxidation forms a negative feedback to this highly nonlinear process. It offers the possibility of stable writing of oxide line structures narrower than the diffraction limited focused laser spot. The optimum metal film thickness is of the order of the light absorption length in the metal. Transparent isolated oxide lines and gratings with periods down to 250 nm and line width down to 165 nm were recorded in 6–15 nm thick Ti films on glass by using the radiation of the Ar ion laser (λ=488, 514 nm). © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.116853
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  • 7
    Electronic Resource
    Electronic Resource
    Diameter grouping in bulk samples of single-walled carbon nanotubes from optical absorption spectroscopy (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 75 (1999), S. 2217-2219 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The influence of the synthesis parameters on the mean characteristics of single-wall carbon nanotubes in soot produced by the laser vaporization of graphite has been analyzed using optical absorption spectroscopy. The abundance and mean diameter of the nanotubes were found to be most influenced by the furnace temperature and the cobalt/nickel catalyst mixing ratio. Via an analysis of the fine structure in the optical spectra, the existence of preferred nanotube diameters has been established and their related fractional abundance could be determined. The results are consistent with nanotubes located mainly around the armchair axis. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.124969
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  • 8
    Electronic Resource
    Electronic Resource
    Grafted macromolecules with adsorbing ends (1996)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 105 (1996), S. 2119-2126 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Using a self-consistent field approach we analyze the equilibrium characteristics of macromolecules grafted at one end onto a planar surface and having an adsorbing group at the second end. Three different systems are considered: (1) isolated end-adsorbing Gaussian chain, (2) end-adsorbing chains admixed into a polymer brush with nonadsorbing free ends, and (3) polymer brush formed by the end-adsorbing macromolecules. The dependences of the average height and dispersion of the adsorbing ends are calculated as functions of the adsorption energy and the chain length. The experimental results on relevant systems are discussed. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.472044
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  • 9
    Electronic Resource
    Electronic Resource
    Morphology and structure of nanoscale Co-Cu multilayers (1999)
    Springer
    Fresenius' journal of analytical chemistry 365 (1999), S. 263-268 
    Details
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Nanoscale cobalt-copper multilayers prepared by pulsed laser deposition on oxidized silicon substrate were investigated by means of transmission electron microscopic (TEM) methods combined with energy dispersive X-ray spectroscopy. The multilayers proved to be polycrystalline with grain sizes between some nanometers and the stack thickness. The topmost copper layer was incomplete with droplets up to 1 μm. For single layer thicknesses greater than 4 nm it could be shown that the structure of the layer stacks was face centred cubic with hexagonal close packed parts in the cobalt layers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002160051485
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  • 10
    Electronic Resource
    Electronic Resource
    Structural investigations of laser-deposited Fe/Al multilayers (1999)
    Springer
    Applied physics 68 (1999), S. 497-503 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 68.55.-a
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract. Fe/Al multilayers are prepared by crossed-beam pulsed laser deposition and investigated by Rutherford backscattering, conversion electron Mössbauer spectroscopy, and transmission electron microscopy. The results are compared to purely ballistic simulations of the deposition process using the TRIDYN4.0 code. It is found that the intermixing of adjacent layers must be described in terms of ballistic mixing followed by chemical mixing. The phase formation in the transition layer between adjacent layers follows the non-equilibrium behavior of Fe/Al in analogy to investigations on mechanically alloyed and ion-beam-mixed Fe/Al. In Fe-rich areas a bcc solid solution is formed. In Al-rich environment an amorphous phase is observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003390050932
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