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The Effective Temperature of Ions Stored in a Linear Quadrupole Ion Trap Mass Spectrometer

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Journal of The American Society for Mass Spectrometry

Abstract

The extent of internal energy deposition into ions upon storage, radial ejection, and detection using a linear quadrupole ion trap mass spectrometer is investigated as a function of ion size (m/z 59 to 810) using seven ion-molecule thermometer reactions that have well characterized reaction entropies and enthalpies. The average effective temperatures of the reactants and products of the ion-molecule reactions, which were obtained from ion-molecule equilibrium measurements, range from 295 to 350 K and do not depend significantly on the number of trapped ions, m/z value, ion trap q z value, reaction enthalpy/entropy, or the number of vibrational degrees of freedom for the seven reactions investigated. The average of the effective temperature values obtained for all seven thermometer reactions is 318 ± 23 K, which indicates that linear quadrupole ion trap mass spectrometers can be used to study the structure(s) and reactivity of ions at near ambient temperature.

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Acknowledgment

The authors thank the ARC for Funding through the Centre of Excellence program.

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Author notes

  1. William A. Donald

    Present address: School of Chemistry, University of New South Wales, Sydney, New South Wales, 2052, Australia

Authors and Affiliations

  1. School of Chemistry, Bio21 Institute of Molecular Science and Biotechnology, & Australian Research Council Centre of Excellence for Free Radical Chemistry and Biotechnology, University of Melbourne, Victoria, 3010, Australia

    William A. Donald, George N. Khairallah & Richard A. J. O’Hair

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  1. William A. Donald
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  2. George N. Khairallah
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  3. Richard A. J. O’Hair
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Correspondence to William A. Donald.

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Donald, W.A., Khairallah, G.N. & O’Hair, R.A.J. The Effective Temperature of Ions Stored in a Linear Quadrupole Ion Trap Mass Spectrometer. J. Am. Soc. Mass Spectrom. 24, 811–815 (2013). https://doi.org/10.1007/s13361-013-0625-x

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  • DOI: https://doi.org/10.1007/s13361-013-0625-x

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