Details
| Original language | English |
|---|---|
| Pages (from-to) | 467-473 |
| Number of pages | 7 |
| Journal | Sensors and Actuators, B: Chemical |
| Volume | 204 |
| Publication status | Published - 10 Aug 2014 |
Abstract
Ion mobility spectrometry (IMS) is a well-known technique for fast trace gases detection. Employing atmospheric pressure chemical ionization in IMS, ion clusters, e.g. protonated monomer or proton bound dimer analyte ions such as MH+(H2O)n or M2H+(H 2O)n form in the positive mode, where the chemical ionization is based on positively charged reactant ions H+(H 2O)n. In the negative mode, where the ionization is based on negatively charged reactant ions O2-(H 2O)n, similar cluster formation is possible but less common. In this paper, we investigate 2-chlorophenol, formic acid and toluene-diisocyanate as single substances and in mixtures, showing their different behavior regarding the formation of symmetric and asymmetric clusters and thus the presence and absence of additional peaks in the ion mobility spectra. Quantum-chemical calculations regarding the stabilization energy can explain the absence of certain cluster signals quite well when based on the assumption of ionization by electron capture in contrast to the typically expected ionization by proton abstraction.
Keywords
- Cluster stabilization energy, Ion cluster formation, Ion mobility spectrometry, Negative mode, Pulsed electron beams, Quantum chemical calculation
ASJC Scopus subject areas
- Materials Science(all)
- Electronic, Optical and Magnetic Materials
- Physics and Astronomy(all)
- Instrumentation
- Physics and Astronomy(all)
- Condensed Matter Physics
- Materials Science(all)
- Surfaces, Coatings and Films
- Materials Science(all)
- Metals and Alloys
- Engineering(all)
- Electrical and Electronic Engineering
- Materials Science(all)
- Materials Chemistry
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In: Sensors and Actuators, B: Chemical, Vol. 204, 10.08.2014, p. 467-473.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Investigation of ion cluster formation in a pulsed ion mobility spectrometer operating in the negative mode
AU - Gunzer, Frank
AU - Zimmermann, Stefan
N1 - Copyright: Copyright 2014 Elsevier B.V., All rights reserved.
PY - 2014/8/10
Y1 - 2014/8/10
N2 - Ion mobility spectrometry (IMS) is a well-known technique for fast trace gases detection. Employing atmospheric pressure chemical ionization in IMS, ion clusters, e.g. protonated monomer or proton bound dimer analyte ions such as MH+(H2O)n or M2H+(H 2O)n form in the positive mode, where the chemical ionization is based on positively charged reactant ions H+(H 2O)n. In the negative mode, where the ionization is based on negatively charged reactant ions O2-(H 2O)n, similar cluster formation is possible but less common. In this paper, we investigate 2-chlorophenol, formic acid and toluene-diisocyanate as single substances and in mixtures, showing their different behavior regarding the formation of symmetric and asymmetric clusters and thus the presence and absence of additional peaks in the ion mobility spectra. Quantum-chemical calculations regarding the stabilization energy can explain the absence of certain cluster signals quite well when based on the assumption of ionization by electron capture in contrast to the typically expected ionization by proton abstraction.
AB - Ion mobility spectrometry (IMS) is a well-known technique for fast trace gases detection. Employing atmospheric pressure chemical ionization in IMS, ion clusters, e.g. protonated monomer or proton bound dimer analyte ions such as MH+(H2O)n or M2H+(H 2O)n form in the positive mode, where the chemical ionization is based on positively charged reactant ions H+(H 2O)n. In the negative mode, where the ionization is based on negatively charged reactant ions O2-(H 2O)n, similar cluster formation is possible but less common. In this paper, we investigate 2-chlorophenol, formic acid and toluene-diisocyanate as single substances and in mixtures, showing their different behavior regarding the formation of symmetric and asymmetric clusters and thus the presence and absence of additional peaks in the ion mobility spectra. Quantum-chemical calculations regarding the stabilization energy can explain the absence of certain cluster signals quite well when based on the assumption of ionization by electron capture in contrast to the typically expected ionization by proton abstraction.
KW - Cluster stabilization energy
KW - Ion cluster formation
KW - Ion mobility spectrometry
KW - Negative mode
KW - Pulsed electron beams
KW - Quantum chemical calculation
UR - http://www.scopus.com/inward/record.url?scp=84906717874&partnerID=8YFLogxK
U2 - 10.1016/j.snb.2014.07.114
DO - 10.1016/j.snb.2014.07.114
M3 - Article
AN - SCOPUS:84906717874
VL - 204
SP - 467
EP - 473
JO - Sensors and Actuators, B: Chemical
JF - Sensors and Actuators, B: Chemical
SN - 0925-4005
ER -