Ion-molecule reactions of CoAr(6)(+) with di- and trifluorobenzenes probe absolute pressure in FT-ICR MS.

Hockendorf, R. F., van der Linde, C., Balaj, O. P., Herber, I. and Beyer, M. K. (2011) Ion-molecule reactions of CoAr(6)(+) with di- and trifluorobenzenes probe absolute pressure in FT-ICR MS. International Journal of Mass Spectrometry, 300 (1). pp. 44-49. DOI 10.1016/j.ijms.2010.12.007.

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Abstract

A recently introduced pressure calibration scheme with CoAr(6)(+) as pressure probe agent was reinvestigated with di- and trifluorobenzenes using Fourier transform ion cyclotron resonance (FT-ICR) mass spectrometry. For all reactants ligand exchange was observed as primary reaction. As secondary reactions, ligand exchange and radiative association took place. The results show that pressure calibration for sticky substances is difficult in ultra-high vacuum (UHV), and that ion-molecule reactions which proceed with collision rate are ideal in situ pressure probes. A finite-elements simulation of the UHV pressure as a function of time reproduces the experimental findings. The simulation also shows that the actual reactant gas pressure may exhibit significant drift, which is not visible at the pressure gauge. (C) 2010 Elsevier B.V. All rights reserved.

Document Type: Article
Keywords: Gas-phase reactions Pressure calibration Rate constant Ligand exchange Metal-rare gas complexes infrared radiative dissociation dipole orientation theory gas-phase unimolecular dissociation gauge sensitivities argon complexes clusters collisions activation fragmentation
Research affiliation: Kiel University
Refereed: Yes
DOI etc.: 10.1016/j.ijms.2010.12.007
ISSN: 1387-3806
Date Deposited: 01 Nov 2012 05:04
Last Modified: 23 Jan 2013 10:00
URI: http://oceanrep.geomar.de/id/eprint/17539

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