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  • Analytical Chemistry and Spectroscopy  (3)
  • 1
    Electronic Resource
    Electronic Resource
    Control of ion kinetic energy in ion cyclotron resonance spectrometry: Very-low-energy collision-induced dissociation (1992)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 6 (1992), S. 303-305 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: A novel means of effecting collision-induced dissociation of molecular ions for use in conjuction with Fourier-transform ion cyclotron resonance (FT-ICR) mass spectrometry is reported. Using an electronic circuit external to the ICR hardware and software, ions are continuously acceperated and decelerated over a period of hundreds of milliseconds by rledpreatedly shifting the phase of the radio frequency excitation driving signal by 180°. At low kinetic energies, a succession of collisions which transfer small amounts of energy favors the lowest energy fragmentation pathway and allows ions with large activation energies to fragmentation of n-butylbenzene cation and by extremely large secondary isotope effects in the dissociation of t-butoxide-d6 anion.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290060416
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  • 2
    Electronic Resource
    Electronic Resource
    Gas-phase nucleophilic displacement reactions (1995)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 30 (1995), S. 1653-1662 
    Details
    ISSN: 1076-5174
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Displacement reactions of each of a variety of anionic nucleophiles reacting with each of a variety of neutrals have been studied by pulsed ion cyclotron resonance (ICR) spectroscopy. Rate constants for these reactions are interpreted in terms of a three-step reaction sequence. RRKM calculations are used to obtain information about the energy of transition states. The origin of the barrier to reaction in solution is discussed.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jms.1190301204
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  • 3
    Electronic Resource
    Electronic Resource
    Some historical background on the double-well potential model (1995)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 30 (1995), S. 1649-1651 
    Details
    ISSN: 1076-5174
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jms.1190301203
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    Paper (German National Licenses)
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