Details
| Original language | English |
|---|---|
| Pages (from-to) | 165-170 |
| Number of pages | 6 |
| Journal | Sensors and Actuators, A: Physical |
| Volume | 206 |
| Publication status | Published - 1 Feb 2014 |
Abstract
In this paper, we introduce a simple to manufacture, emission current controlled, miniaturized non-radioactive electron source to provide free electrons at atmospheric pressure. In atmospheric pressure chemical ionization as usually used in ion mobility spectrometry radioactive beta minus sources provide free electrons with high kinetic energy to initiate a chemical gas phase ionization of the analytes. Here, classical thermionic emission from a heat controlled tungsten filament in vacuum is used to generate free electrons. These are then accelerated towards an electron transparent 300 nm thin Si 3N4-membrane through which the electrons are transferred from vacuum to atmospheric pressure. Both, the emitted electron current and the average kinetic electron energy can be controlled. For similar ionization processes as compared to radioactive beta minus sources we operate the electron source with an electron emission current at atmospheric pressure of 50 pA - corresponding to an activity of 300 MBq - and an average kinetic electron energy of 8.6 keV.
Keywords
- APCI, Atmospheric pressure chemical ionization, IMS, Ion mobility spectrometry, Non-radioactive electron source, Thermionic electron emission
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
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In: Sensors and Actuators, A: Physical, Vol. 206, 01.02.2014, p. 165-170.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - A current controlled miniaturized non-radioactive electron emitter for atmospheric pressure chemical ionization based on thermionic emission
AU - Cochems, P.
AU - Runge, M.
AU - Zimmermann, S.
N1 - Copyright: Copyright 2014 Elsevier B.V., All rights reserved.
PY - 2014/2/1
Y1 - 2014/2/1
N2 - In this paper, we introduce a simple to manufacture, emission current controlled, miniaturized non-radioactive electron source to provide free electrons at atmospheric pressure. In atmospheric pressure chemical ionization as usually used in ion mobility spectrometry radioactive beta minus sources provide free electrons with high kinetic energy to initiate a chemical gas phase ionization of the analytes. Here, classical thermionic emission from a heat controlled tungsten filament in vacuum is used to generate free electrons. These are then accelerated towards an electron transparent 300 nm thin Si 3N4-membrane through which the electrons are transferred from vacuum to atmospheric pressure. Both, the emitted electron current and the average kinetic electron energy can be controlled. For similar ionization processes as compared to radioactive beta minus sources we operate the electron source with an electron emission current at atmospheric pressure of 50 pA - corresponding to an activity of 300 MBq - and an average kinetic electron energy of 8.6 keV.
AB - In this paper, we introduce a simple to manufacture, emission current controlled, miniaturized non-radioactive electron source to provide free electrons at atmospheric pressure. In atmospheric pressure chemical ionization as usually used in ion mobility spectrometry radioactive beta minus sources provide free electrons with high kinetic energy to initiate a chemical gas phase ionization of the analytes. Here, classical thermionic emission from a heat controlled tungsten filament in vacuum is used to generate free electrons. These are then accelerated towards an electron transparent 300 nm thin Si 3N4-membrane through which the electrons are transferred from vacuum to atmospheric pressure. Both, the emitted electron current and the average kinetic electron energy can be controlled. For similar ionization processes as compared to radioactive beta minus sources we operate the electron source with an electron emission current at atmospheric pressure of 50 pA - corresponding to an activity of 300 MBq - and an average kinetic electron energy of 8.6 keV.
KW - APCI
KW - Atmospheric pressure chemical ionization
KW - IMS
KW - Ion mobility spectrometry
KW - Non-radioactive electron source
KW - Thermionic electron emission
UR - http://www.scopus.com/inward/record.url?scp=84892368117&partnerID=8YFLogxK
U2 - 10.1016/j.sna.2013.11.033
DO - 10.1016/j.sna.2013.11.033
M3 - Article
AN - SCOPUS:84892368117
VL - 206
SP - 165
EP - 170
JO - Sensors and Actuators, A: Physical
JF - Sensors and Actuators, A: Physical
SN - 0924-4247
ER -