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  • 1
    Electronic Resource
    Electronic Resource
    Study of the Effect of Decomposition Methods on the Accurate Determination of Zinc in Biological Samples By Electrophoresis (1985)
    s.l. : American Chemical Society
    Analytical chemistry 57 (1985), S. 472-474 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac50001a035
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  • 2
    Electronic Resource
    Electronic Resource
    Effect of wet decomposition methods on the determination of cobalt, copper, selenium, and zinc in biological samples using electrophoresis (1990)
    s.l. : American Chemical Society
    Analytical chemistry 62 (1990), S. 146-150 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac00201a010
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  • 3
    Electronic Resource
    Electronic Resource
    Photodissociation of CBrCl3 at 193 nm by translational spectroscopy (1995)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 103 (1995), S. 6966-6972 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The photodissociation of CBrCl3 at 193 nm has been studied by translational spectroscopy. Two major dissociation channels, (1) CBrCl3→CCl3+Br and (2) CBrCl3→CBrCl2+Cl, are detected with product translational energies of 17 and 22 kcal/mol, respectively. The relative yield of (1):(2) is calculated to be 7:3. The primary product, CBrCl2, which is internally excited, undergoes unimolecular decay to form the CCl2+Br products. From the derived values of the anisotropy parameter β, we conclude that these processes take place rapidly after excitation via an A1←A1 transition, with the transition moment aligned parallel to the threefold axis. Results obtained for these two primary pathways and other minor processes are discussed in terms of a simple direct dissociation mechanism. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.470374
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  • 4
    Electronic Resource
    Electronic Resource
    Ultraviolet photodissociation study of CH3SCH3 and CH3SSCH3 (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 100 (1994), S. 7376-7384 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The photodissociation processes of CH3SSCH3 at 248 and 193 nm and CH3SCH3 at 193 nm have been studied by translational spectroscopy. When excited at 248 nm, CH3SSCH3 undergoes a simple S–S bond scission to produce two CH3S fragments with an average translational energy of 33 kcal/mol. The angular distribution of the product with respect to the polarized laser is measured and fitted with an anisotropy parameter β=1.2. It indicates that the dissociation is a fast, direct process. At 193 nm, there is only a simple dissociation channel for CH3SCH3, while CH3SSCH3 undergoes a predominant C–S bond scission with the S–S bond scission as a minor channel. No angular dependence for the primary products from both CH3SCH3 and CH3SSCH3 has been observed. The observation of S+2 time-of-flight spectra shows that a major fraction of CH3S2, which is internally excited when produced, undergoes spontaneous dissociation to form slow S2 and CH3 radicals. Results obtained for the dissociation processes of both molecules at 193 nm are rationalized and comparisons with previous investigations [J. Chem. Phys. 92, 6587 (1990); 95, 5014 (1991)] are also included.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.466881
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  • 5
    Electronic Resource
    Electronic Resource
    The 193 nm photodissociation of CH2(Double Bond)CClF (2000)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 113 (2000), S. 5331-5338 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The photodissociation of CH2(Double Bond)CClF at 193 nm has been studied by product translational spectroscopy. A total of five primary dissociation channels was detected for the products of Cl (fast), HCl, HF, Cl (slow), and F in the decreasing order of relative yield. Product translational energy distributions have been measured for these reaction products. While a thermal-like distribution was detected for the slow Cl and F atoms, a nonthermal distribution was determined for the fast Cl atom and the molecular elimination of HCl and HF. Apart from the fast Cl atom with anisotropy parameter β=0.5, the remaining products recoil isotropically following photolysis with linearly polarized light. By analogy with the photodissociation of chloroethylenes, these products are found to originate from two potential energy surfaces. In addition to the primary dissociation channels, we have detected the secondary products of F+C2H2 from the internally excited α-fluorovinyl radical through a fast fragment isomerization. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1289242
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  • 6
    Electronic Resource
    Electronic Resource
    Photodissociation of CF2(Double Bond)CFCl at 193 nm by translational spectroscopy (2000)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 113 (2000), S. 6107-6112 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The photodissociation of CF2(Double Bond)CFCl at 193 nm has been studied by product translational spectroscopy. Results show that the molecule undergoes competing dissociation into three pairs of products: (1) CFCl+CF2, (2) C2F2Cl+F, and (3) C2F3+Cl with a relative yield of 1.0:∼0.1:1.4. When photolyzed with polarized laser light, reactions (1) and (3) were detected with fragments recoiling anisotropically, indicating that dissociation occurs primarily on the excited potential energy surface. From the maximum kinetic energy derived for reactions (2) and (3), a upper limit of 110 and 90 kcal/mol was determined for the C–F bond and the C–Cl bond dissociation energy, respectively. In addition to these primary dissociation channels, we have observed the secondary products, CF+CF2 and F+C2F2 from the primary fragment C2F3 by absorbing an additional photon. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1308558
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  • 7
    Electronic Resource
    Electronic Resource
    Photodissociation of 1,2-C2H2Br2 at 248 nm: Competition between three-body formation Br+Br+C2H2 and molecular Br2 elimination (2001)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 115 (2001), S. 3195-3200 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The photodissociation of 1,2-C2H2Br2 at 248 nm has been studied by product translational spectroscopy. The results show that the molecule dissociates exclusively into the products (1) Br2+C2H2 and (2) Br (fast)+Br (slow)+C2H2 with a branching ratio ∼0.2:0.8. While the cleavages of the C–Br bonds are not symmetric, producing the Br atoms at unequal velocities, the anisotropy of the products indicates that both reactions occur in a fraction of a rotational period. Following an asynchronous concerted reaction, the triple products were simulated with the P(Et) distributions coupled by asymmetric angular distributions. A mechanism consistent with the measured results is proposed that the Br2 elimination is a result of a fast intersystem crossing from the ππ* pumped state while the triple products occur via a simultaneous asymmetric scission of the C–Br bonds along the nσ* state. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1387476
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  • 8
    Electronic Resource
    Electronic Resource
    Synthesis and structure of dihydroxo(η3-2,2'-iminodiethoxo)germanium(IV) (1992)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 48 (1992), S. 991-993 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108270191012398
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  • 9
    Electronic Resource
    Electronic Resource
    Electrochemical synthesis and properties of polyaniline on thermally prepared RuO"2 electrodes
    Amsterdam : Elsevier
    Electrochimica Acta 39 (1994), S. 393-400 
    Details
    ISSN: 0013-4686
    Keywords: RuO"2 electrode ; XPS. ; cyclic voltammetry ; polyaniline
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0013-4686(94)80078-2
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  • 10
    Electronic Resource
    Electronic Resource
    Sulphur content and the hydrogen evolving activity of NiS x deposits using statistical experimental strategies (1994)
    Springer
    Journal of applied electrochemistry 24 (1994), S. 233-238 
    Details
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract The effect of such electroplating conditions as current density, thiourea (TU) concentration, temperature and pH on the sulphur content of NiS x deposited electrodes has been systematically studied using fractional factorial design and response surface methodology. Fractional factorial analysis indicates that the main and interaction effects of TU concentration and current density are the key variables influencing sulphur content in a NiS x deposit. Empirical models for sulphur content and hydrogen evolution overpotential are fitted and plotted, using central composite experimental design, as contour diagrams in order to facilitate comparison with experimental sulphur content trends and hydrogen evolving activity. The results show that, for deposits containing 〉 12 wt % sulphur content, hydrogen evolving activity increases with increasing sulphur content, while for those possessing 〈 12 wt% sulphur content, hydrogen evolution overpotential decreases with increasing electroplating current density.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00242889
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