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  • 1
    Digitale Medien
    Digitale Medien
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 86 (1987), S. 6782-6791 
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: Experiments are described in which resonance electron attachment reactions A+e→A−, where A is SF6 or perfluoromethylcyclohexane (C7F14), are made to occur under conditions in which the observed depletion of A is affected not only by the electron attachment reaction, but also by the detailed nature of the subsequent recombination of the molecular anions with positive ions, p++A−→neutrals. It will be shown that the composite rate coefficients thereby measured, along with knowledge of the electron attachment coefficients, allow the efficiencies of molecular regeneration by ion–ion recombination, p++A−→A+neutrals, to be determined for A−=SF−6 and C7F−14. It is shown that SF−6 is converted by recombination primarily to unknown neutral species which do not undergo further electron attachment. It is also shown that C7F−14 is converted by recombination primarily back to the molecular species, C7F14.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 9 (1986), S. 320-327 
    ISSN: 0935-6304
    Schlagwort(e): Gas chromatography ; Electron capture detector, ECD ; Electron capture sensitization ; Polynuclear aromatic hydrocarbons ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The electron capture detector (ECD) response to numerous aromatic hydrocarbons of low electron affinity (EA) is shown to be detrimentally affected by two processes which compete with and typically overwhelm the electron capture reactions of these molecules. It is shown that the effects of these two undesired reactions can be eliminated by the permanent addition of trimethylamine and one of several alkyl monochlorides to the detector make-up gas. These modifications of the detector gas result in greatly increased sensitivity, increased linearity, and increased reproducibility of response. A kinetic model for the ECD responses of low EA resonance capture molecules is developed which appears to explain these improvements.
    Zusätzliches Material: 7 Ill.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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