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  • 1
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 106 (1997), S. 1676-1686 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: In this paper, new experimental results using UV spectroscopy of the small benzene–Arn clusters are presented. We have found evidence for the vibrational predissociation of the S1 state of some of these species on a nanosecond time scale and we propose a new assignment for the UV spectral features of this system. This assignment is consistent with other experimental data and it accounts additionally for the previously reported spectral anomalies, in particular the ionization potential measurements of these species. The two-color R2PI spectra performed can thus be considered as nanosecond pump–probe experiments that allow us to estimate the relaxation rate of the S1state of these clusters. The vibrational relaxation is found to be strongly size and structure dependent: The two isomers [(1/1) and (2/0)] of the n=2 species exhibit different lifetimes differing by at least one order of magnitude. The size dependence of the relaxation process within the one-sided isomer series appears also paradoxical since the relaxation rates of the (3/0) and (4/0) species are found to be smaller than that of the (2/0). These properties are discussed in relationship with the symmetry of these species. © 1997 American Institute of Physics.
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  • 2
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 68 (1997), S. 3866-3871 
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: In the present work, we describe a new Kelvin probe for dynamical work function change (ΔΦ) measurements in ultrahigh vacuum. The construction of the Kelvin probe is especially optimized to meet the experimental conditions for gas-adsorption experiments as well as for in situfilm growth investigations during metal deposition. This is realized by a new setup which enables a change of the geometrical orientation of the vibrating reference electrode with respect to the sample surface. The Kelvin probe combined with thermal desorption spectroscopy, Auger electron spectroscopy, and scanning tunneling microscopy facilities, forms a powerful tool for film growth analysis. The performance of the instrumentation is demonstrated with some representative test experiments for copper deposition on Pt(111). © 1997 American Institute of Physics.
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  • 3
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 79 (1975), S. 2531-2535 
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 71 (1997), S. 1441-1443 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have developed a new microfabrication technique for the construction of three-dimensional photonic crystals. In particular, we used multiple tilted x-ray lithography exposures in order to construct structures with photonic band gaps in the infrared region. First polymethylmethacrylate (PMMA) resist layers with a thickness of 500 μm were irradiated, then the holes in the resist structure were filled with preceramic polymer and subsequent pyrolysis converts the preceramic polymer into a SiCN ceramic. Theoretical results with fitted values of the dielectric constant are in good agreement with the transmission measurements. © 1997 American Institute of Physics.
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Colloid & polymer science 104 (1997), S. 81-89 
    ISSN: 1435-1536
    Keywords: Confined fluids ; freezing transitions ; colloidal suspensions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The freezing transition of hard sphere colloids confined between two parallel hard plates is studied for different plate distances ranging from one to two particle diameters. Using Monte Carlo simulations and free volume theory, the full phase diagram is obtained exhibiting solid-to-solid transitions between buckled, rhombic and layered crystals involving several triangular or square layers. While the fluid freezing transition is always strongly first order, both strong and extremely weak transitions occur between different crystalline structures. These predictions should be experimentally observable in confined suspensions of sterically stabilized or highly salted charge-stabilized colloidal particles.
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Colloid & polymer science 104 (1997), S. 129-131 
    ISSN: 1435-1536
    Keywords: Polyorganosiloxane ; microgels-colloids ; forced Rayleigh scattering
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract We describe the synthesis of microgel spheres of 10 nm radius which are suitable as probes to study diffusion by forced Rayleigh scattering (FRS), a holographic grating technique. Those particles are obtained by a copolycondensation in microemulsion. The main advantage of organosiloxanes compared to purely organic monomers as styrene or methacrylate is the simple chemical functionalization of the particles. A rich choice of silane monomers which may be copolycondensated with the standard monomer trimethoxymethylsilane are commercially available. One of those, chlorobenzyltrimethoxysilane, is used as a coupling agent to attach the photoreactive dye orthonitrostilbene (ONS) to the microgel spheres. All samples are characterized by light scattering, GPC and electron microscopy. In addition, we determined the content of photoreactive dye chemically attached to the spherical particles by UV/visible absorption-spectroscopy. Our nano-particles are redispersible in organic solvents such as toluene or THF up to weight fractions as high as 50 wt%. To prove applicability of the particles as FRS probes we show some preliminary results obtained from FRS measurements of highly concentrated toluene solutions (particle concentration 45–50 wt%).
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Colloid & polymer science 104 (1997), S. 177-179 
    ISSN: 1435-1536
    Keywords: Hard spherocylinders ; phase transitions ; cell theory
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract A cell theory is proposed to obtain the full phase diagram of hard spherocylinders involving isotropic, nematic, smectic as well as plastic and aligned crystalline phases. Despite its conceptual and numerical simplicity this free-volume theory yields the correct topology of the phase diagram in semi-quantitative agreement with recent computer simulations.
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Colloid & polymer science 104 (1997), S. 191-193 
    ISSN: 1435-1536
    Keywords: Evanescent dynamic light scattering ; colloidal dispersions ; film formation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract We have applied evanescent dynamic light scattering (DLS) to study the film formation of polymer latex dispersions. A dynamical glass transition is observed. When the particles fuse, the scattering rate decreases. After fusion, a new fast process (τ r 1 ms) is observed, which is not present in bulk DLS data. We attribute the process to discontinuous relaxation of surface induced stresses (transient micro-cracks).
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  • 9
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Carbonyl Metal Compounds with Polydentate Cyclic Ligands. I. Pentacarbonyl Complexes of s-Trithiane and Related CompoundsThe complexes (RCHS)nM(CO)5 (R = H, CH3, n = 3; R = H, n = 4; M = Cr, Mo, W) were prepared from the tetrahydrofuran pentacarbonyl metal compounds and the respective ligands. The Cotton-Kraihanzel force constants of these complexes indicate the sulfur ligands to be slightly more basic than triphenylphosphine. The trimethyltrithiane complexes (R = CH3, n = 3) exhibit rapid intramolecular exchange of the M(CO)5-group along the three coordination centers of the ligand.
    Notes: Die Komplexe (RCHS)nM(CO)5 (R = H, CH3, n = 3; R = H, n = 4; M = Cr, Mo, W) wurden aus den Tetrahydrofuran-pentacarbonylmetallverbindungen und dem jeweiligen Liganden dargestellt. Die Cotton-Kraihanzel-Kraftkonstanten dieser Komplexe weisen die Schwefelliganden als geringfügig schwächere Akzeptoren, verglichen mit Triphenyl-phosphin, aus. Die Komplexe des Trimethyltrithians (R = CH3, n = 3) zeigen einen raschen intramolekularen Austausch der M(CO)5-Gruppe über die drei Koordinationsstellen des Liganden.
    Additional Material: 4 Tab.
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  • 10
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 418 (1975), S. 208-216 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Some Substitution Reactions of Trimeric ThioformaldehydeTreatment of s-trithiane with n-butyllithium results in the formation of lithium salts of carbenium ions. Their reactions with the halo-functional compounds lead to mono- or multi-substituted trithianes besides lithium chloride.
    Notes: Die Behandlung von s-Trithian mit n-Butyllithium führt zu Lithiumsalzen von Carbanionen. Bei der Umsetzung mit den halogenfunktionellen Verbindungen CH3J. (CH3)3SiCl, (CH3)3GeCl, (CH3)3SnCl und (CH3)2SiCl2 reagieren diese unter Abspaltung von LiCl zu ein- oder mehrfach substituierten s-Trithianen.
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