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Estimation of effective ion temperatures in a quadrupole ion trap

Authors
Journal
Journal of the American Society for Mass Spectrometry
1044-0305
Publisher
Springer-Verlag
Publication Date
Volume
9
Issue
8
Identifiers
DOI: 10.1016/s1044-0305(98)00055-5
Disciplines
  • Chemistry

Abstract

Abstract A modified Finnigan LCQ quadrupole ion trap has been used to determine the equilibrium constant of the complexation reaction of thiophenolate with 2,2,2-trifluoroethanol. The process is particularly useful as a thermometer reaction because it has an exceptionally large temperature dependence. Using literature values for the thermochemistry, an effective ion temperature of 310 ± 20 K is indicated for the ion trap. This value is much lower than some earlier estimates for ion traps, but is consistent with a recent theoretical analysis and some previous interpretations of experimental data. The results suggest that quadrupole ion traps are suitable for studying gas phase reactions under nearly thermal conditions.

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