The first quantitative chemical analysis of polar stratospheric cloud particles has recently been performed using a balloon-borne aerosol composition mass spectrometer (ACMS). A similar spectrometer is presently used in a large cryo-chamber experiment to study low temperature aerosols. All experiments require prior to their employment an accurate calibration to convert mass spectrometer signals into molecular species contained in the aerosols. For the calibration, pure H 2 SO 4 /H 2 O droplets are generated having known composition and diameters between 0.4 w m and 1 w m. The size distribution and the number concentration can be controlled. A flow reactor with a rotating inner glass cylinder placed in a H 2 SO 4 /H 2 O bath solution of known concentration is used to condition the droplets. The residence time of the particles in the flow reactor is long enough that the droplets adopt the composition of the bath solution before entering the ACMS. The result is a linear relationship between the mole ratio of the H 2 SO 4 /H 2 O droplets and the mass spectrometer count rate ratio of water to sulfuric acid. The evaluation takes the dissociation of H 2 SO 4 inside the ACMS into account. The calibration error varies between 3 and 4 wt. % H 2 SO 4 for stratospheric particles with a composition of 30-70 wt. % H 2 SO 4 . Besides the calibration of the instrument, the analysis of the aerosols is a valuable diagnostic tool to investigate impurities in the particles.
Free access
Calibration of an Aerosol Composition Mass Spectrometer with Sulfuric Acid Water Aerosol
Reprints and Corporate Permissions
Please note: Selecting permissions does not provide access to the full text of the article, please see our help page How do I view content?
To request a reprint or corporate permissions for this article, please click on the relevant link below:
Academic Permissions
Please note: Selecting permissions does not provide access to the full text of the article, please see our help page How do I view content?
Obtain permissions instantly via Rightslink by clicking on the button below:
If you are unable to obtain permissions via Rightslink, please complete and submit this Permissions form. For more information, please visit our Permissions help page.
Related research
People also read lists articles that other readers of this article have read.
Recommended articles lists articles that we recommend and is powered by our AI driven recommendation engine.
Cited by lists all citing articles based on Crossref citations.
Articles with the Crossref icon will open in a new tab.