Atmospheric Measurement Techniques
www.atmos-meas-tech.net
1867-1381
1867-8548
2
2
2009
10.5194/amt-2-355-2009
http://www.atmos-meas-tech.net/2/355/2009/
http://www.atmos-meas-tech.net/2/355/2009/amt-2-355-2009.html
http://www.atmos-meas-tech.net/2/355/2009/amt-2-355-2009.pdf
355
361
2009-07-24
Design and construction of a simple Knudsen Effusion Mass Spectrometer (KEMS) system for vapour pressure measurements of low volatility organics
A. M. Booth
alastair.booth@manchester.ac.uk
T. Markus
G. McFiggans
C. J. Percival
M. R. Mcgillen
D. O. Topping
School of Earth, Environmental and Atmospheric Science, University of Manchester, UK
Research Center Jülich, 52425 Jülich, Germany
A design of and initial results from a Knudsen Effusion Mass Spectrometer
(KEMS) are presented. The design was adapted from high temperature alloy
studies with a view to using it to measure vapour pressures for low
volatility organics. The system uses a temperature controlled cell with an
effusive orifice. This produces a molecular beam which is sampled by a
quadropole mass spectrometer with electron impact ionization calibrated to a
known vapour pressure. We have determined <i>P</i><sub>(298 K)</sub> and
Δ<i>H</i><sub>sub</sub> of the first 5 saturated straight chain dicarboxylic
acids: 2.15±1.19×10<sup>-2</sup> Pa and 75±19 KJ mol<sup>−1</sup>
respectively for oxalic acid, 5.73±1.14×10<sup>-4</sup> Pa and
91±4 KJ mol<sup>−1</sup> for Malonic acid,
1.13±0.47×10<sup>-4</sup> Pa and 93±6 KJ mol<sup>−1</sup> for
Succinic acid, 4.21±1.66×10<sup>-4</sup> Pa and
123±22 KJ mol<sup>−1</sup> for Glutaric acid and
6.09±3.85×10<sup>-6</sup> Pa and 125±40 KJ mol<sup>−1</sup> for
Adipic acid.
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