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  • 1990-1994  (5)
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  • 1
    Electronic Resource
    Electronic Resource
    Palladium- and molybdenum-catalyzed hydrostannation of alkynes. A novel access to regio- and stereodefined vinylstannanes (1990)
    s.l. : American Chemical Society
    The @journal of organic chemistry 55 (1990), S. 1857-1867 
    Details
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jo00293a035
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Mevva ion source for the application of material surface modification : Proceedings of 5th international conference on ion sources (1994)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 65 (1994), S. 1295-1297 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Several versions of Mevva ion sources have been developed in our institute since 1988. It operates in a pulsed mode with a pulse length of 1.2 ms and a repetition rate of up to 50 pps. A time-averaged beam current of 10 or 50 mA has been extracted at 30–80 kV from Mevva IIA-H and Mevva IIB, respectively. In order to develop surface modification of materials by ion implantation we have constructed three kinds of Mevva ion source implantation systems. High dose (3–5×1017 cm−2) implantation with Ti, Ce, Y, and Ti+C, etc. has been carried out for improving the lifetime of metal cutting tools, relay contacts, dies, and some sophisticated components.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1144985
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Measurement of some parameter on MEVVA ion source : Proceedings of fifth international conference on ion sources (1994)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 65 (1994), S. 1263-1265 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The charge density and the charge state distribution of ions extracted from metal vapor vacuum arc ion source have been measured by single, double probe, and time of flight systems, and the ion beam density distributions near the extracting electrode have been measured with and without a cusped magnetic field in order to improve the performance of ion beams. The charge state distributions as a function for many operational cathode materials were investigated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1145028
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Rate constants for abstraction of hydrogen from ethylene by methyl and ethyl radicals over the temperature range 650-770 K (1990)
    New York, NY : Wiley-Blackwell
    International Journal of Chemical Kinetics 22 (1990), S. 21-35 
    Details
    ISSN: 0538-8066
    Keywords: Chemistry ; Physical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Measurements rate constants for abstraction of hydrogen from ethylene by methyl and ethyl radicals relative to the corresponding rate constants for abstraction from hydrogen, over the temperature range 650-770 K, are reported. The methodis based on the effect of the addition of small quantities of hydrogen on the rates of formation of methane and ethane in the thermalchain reactions of ethylene. On the assumption that methane and ethane are formed by the following reactions: measurements of the relative rates of formation of methane and ethane in the presence and absence of hydrogen gave the following ratios of rate constants: (R = 8.314 Joule mol-1 K-1) \documentclass{article}\pagestyle{empty}\begin{document}$$\begin{array}{l} {\rm log(}k_1 /k_2) = 1.3 \pm 0.15 + 4000 \pm 2000/2.3RT \\ {\rm log(}k_3 /k_4) = 1.6 \pm 0.15 - 0 \pm 2000/2.3RT \end{array}$$\end{document} With values from the literature for k1 and k3 the following values were obtained for k2 and k4: \documentclass{article}\pagestyle{empty}\begin{document}$$ \begin{array}{l} {\rm log}k_2 {\rm (}L{\rm mol}^{{\rm - 1}} {\rm s}^{{\rm - 1}}) = 8.7 \pm 0.2 - 63000 \pm 3000/2.3RT \\ {\rm log}k_4 {\rm (}L{\rm mol}^{{\rm - 1}} {\rm s}^{{\rm - 1}}) = 8.2 \pm 0.2 - 62200 \pm 3000/2.3RT \\ \end{array} $$\end{document}
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/kin.550220103
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Comment: A re-evaluation of the rate constant for abstraction of hydrogen from isobutane by methyl radicals (1990)
    New York, NY : Wiley-Blackwell
    International Journal of Chemical Kinetics 22 (1990), S. 537-541 
    Details
    ISSN: 0538-8066
    Keywords: Chemistry ; Physical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The rate constant for abstraction of hydrogen from isobutane by methyl radicals has been re-examined making use of new measurements at temperatures above 660 K. Most of the data over the temperature range 300-855 K can be accommodated by the following values for the rate constants for abstraction from primary and tertiary hydrogen atoms: \documentclass{article}\pagestyle{empty}\begin{document}$$ {\rm log}k_{4T} ({\rm L mol}^{{\rm - 1}} {\rm s}^{{\rm - 1}}) = 8.15 - \frac{{33800}}{{2.3RT}}\quad (R = 8.314{\rm J mol}^{{\rm - 1}} {\rm K}^{{\rm - 1}}) $$\enddocument} \documentclass{article}\pagestyle{empty}\begin{document}$$ {\rm log}k_{4P} ({\rm L mol}^{{\rm - 1}} {\rm s}^{{\rm - 1}}) = 8.88 - \frac{{48400}}{{2.3RT}}$$\enddocument} This activation energy for abstraction of the tertiary hydrogen atom in isobutane is essentially the same as expressed in a previous evaluation, which considered data only below 500 K, but the magnitude of the rate constant is about 0.25 log units greater.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/kin.550220509
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    Paper (German National Licenses)
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