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An ion trap CIMS instrument for combined measurements of atmospheric OH and H2SO4: First test measurements above and inside the planetary boundary layer

Aufmhoff, Heinfried and Hanke, Markus and Uecker, Jens and Schlager, Hans and Arnold, Frank (2011) An ion trap CIMS instrument for combined measurements of atmospheric OH and H2SO4: First test measurements above and inside the planetary boundary layer. International Journal of Mass Spectrometry, 308 (1), pp. 26-34. DOI: 10.1016/j.ijms.2011.07.016. ISSN 1387-3806.

Full text not available from this repository.

Official URL: http://www.sciencedirect.com/science/article/pii/S1387380611002703

Abstract

Gaseous sulfuric acid (GSA) plays an important role in atmospheric secondary aerosol formation. To quantify its contribution to these processes long-term measurements of GSA using a very sensitive detection method are required. OH is the most important oxidant in the atmosphere and oxidizes, e.g., SO2. A powerful detection method is chemical ionization mass spectrometry (CIMS). We have built a novel CIMS instrument composed of an ion trap mass spectrometer (ITMS) and a selective ion source suitable to measure gaseous H2SO4 and OH and to do fragmentation studies. The probe air inlet and sampling line were optimized to minimize wall losses of H2SO4 and OH. An ion source was developed to minimize artificial signals and to create reagent ions ((HNO3)h(H2O)n) which react highly selectively with GSA. An H2SO4/OH calibration source based on water vapor photolysis was developed to overcome uncertainties in remaining wall losses, ion residence time, reaction rate coefficient and mass discrimination. Field measurements of GSA in the planetary boundary layer (several weeks at northern and middle latitudes) and high-altitude mountain-site measurements of GSA and OH were carried out. The ITMS instrument offers a detection limit as low as 1 × 10^5 molecules per cm^3 and a time resolution of about 2 min .

Document Type:Article
Title:An ion trap CIMS instrument for combined measurements of atmospheric OH and H2SO4: First test measurements above and inside the planetary boundary layer
Authors:
AuthorsInstitution or Email of Authors
Aufmhoff, Heinfriedheinfried.aufmhoff@dlr.de
Hanke, MarkusMPI for Nuclear Physics, Heidelberg
Uecker, JensMPI for Nuclear Physics, Heidelberg
Schlager, HansDLR
Arnold, FrankMPI for Nuclear Physics, Heidelberg
Date:1 November 2011
Journal or Publication Title:International Journal of Mass Spectrometry
Refereed publication:Yes
In Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:308
DOI:10.1016/j.ijms.2011.07.016
Page Range:pp. 26-34
ISSN:1387-3806
Status:Published
Keywords:Sulfuric acid, OH, secondary aerosol formation, Chemical ionization, Ion trap
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:ATM and Operation
DLR - Research area:Aeronautics
DLR - Program:L AO - Air Traffic Management and Operation
DLR - Research theme (Project):L - Climate, Weather and Environment
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Atmospheric Trace Species
Deposited By: Heinfried Aufmhoff
Deposited On:03 Nov 2011 15:00
Last Modified:04 Apr 2013 16:31

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