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Dissociation of proton bound ketone dimers in asymmetric electric fields with differential mobility spectrometry and in uniform electric fields with linear ion mobility spectrometry
journal contribution
posted on 2014-11-26, 11:35 authored by X. An, Gary Eiceman, R-M. Rasanen, J.E. Rodriguez, J.A. StoneThe kinetics for the decomposition of the symmetrical proton-bound dimers of a series of 2-ketones (M) from acetone to 2-nonanone have been determined at ambient pressure by linear ion mobility spectrometry (IMS) and by differential mobility spectrometry (DMS). Decomposition, MH →MH + M, in the IMS instrument, observed under thermal conditions over the temperature range 147 to 172 C, yielded almost identical Arrhenius parameters E = 122 kJ mol and ln A = 38.8 for the dimers of 2-pentanone, 2-heptanone, and 2-nonanone. Ion decomposition in the DMS instrument was due to a combination of thermal and electric field energies at an effective ion internal temperature whose value was estimated by reference to the IMS kinetic parameters. Decomposition was observed with radio frequency (RF) fields with maximum intensities in the range 10 kV cm to 30 kV cm and gas temperatures from 30 to 110 C, which yielded effective temperatures that were higher than the gas temperature by 260 at 30 C and 100 at 110 C. There was a mass dependence of the field for the onset of decomposition: the higher the ion mass, the higher the required field at a given gas temperature, which is ascribed to the associated increasing heat capacity with the increasing carbon number, but similar, internal vibrations and rotations. © 2013 American Chemical Society.
History
School
- Science
Department
- Chemistry
Published in
Journal of Physical Chemistry AVolume
117Issue
30Pages
6389 - 6401Citation
An, X. ... et al., 2013. Dissociation of proton bound ketone dimers in asymmetric electric fields with differential mobility spectrometry and in uniform electric fields with linear ion mobility spectrometry. Journal of Physical Chemistry A, 117 (30), pp. 6389 - 6401.Publisher
© American Chemical SocietyVersion
- VoR (Version of Record)
Publisher statement
This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/Publication date
2013Notes
Closed access.ISSN
1089-5639eISSN
1520-5215Publisher version
Language
- en