Atmospheric Measurement Techniques Discussions
www.atmos-meas-tech-discuss.net
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2010
10.5194/amtd-3-185-2010
http://www.atmos-meas-tech-discuss.net/3/185/2010/
http://www.atmos-meas-tech-discuss.net/3/185/2010/amtd-3-185-2010.html
http://www.atmos-meas-tech-discuss.net/3/185/2010/amtd-3-185-2010.pdf
185
202
2010-01-15
Development and characterization of a High-Temperature Proton-Transfer-Reaction Mass Spectrometer (HT-PTR-MS)
T. Mikoviny
L. Kaser
A. Wisthaler
Institut für Ionenphysik und Angewandte Physik, Universität Innsbruck, Innsbruck, Austria
We have developed a High-Temperature Proton-Transfer-Reaction Mass Spectrometer
(HT-PTR-MS) in which both the ion source and the ion drift tube can be continuously
operated at temperatures up to 250 °C. The instrument was characterized
in a high <i>E/N</i>-mode (130 Td) and in a low <i>E/N</i>-mode (87 Td) at an
operating temperature of 200 °C. Instrumental sensitivities and
2σ-detection limits were on the order of 50–110 cps/ppb and
100 ppt (1 s signal integration time), respectively. The HT-PTR-MS
is primarily intended for measuring "sticky" or semi-volatile trace gases.
Alternatively, it may be coupled to a particle collection/thermal desorption
apparatus to measure particle-bound organics in near real-time. In view of these
applications, we have measured instrumental response times for a series of reference
compounds. 1/e<sup>2</sup>-response times for dimethyl sulfoxide, ammonia and monoethanolamine
were in the sub-second to second regime. 1/e<sup>2</sup>-response times for levoglucosan,
oxalic acid and cis-pinonic acid ranged from 8 to 370 s.
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