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Chemical ionization quadrupole mass spectrometer with an electrical discharge ion source for atmospheric trace gas measurement

MPS-Authors
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Eger,  Philipp G.
Atmospheric Chemistry, Max Planck Institute for Chemistry, Max Planck Society;

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Helleis,  Frank
Max Planck Institute for Chemistry, Max Planck Society;

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Schuster,  Gerhard
Atmospheric Chemistry, Max Planck Institute for Chemistry, Max Planck Society;

/persons/resource/persons101183

Phillips,  Gavin J.
Atmospheric Chemistry, Max Planck Institute for Chemistry, Max Planck Society;

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Lelieveld,  Jos
Atmospheric Chemistry, Max Planck Institute for Chemistry, Max Planck Society;

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Crowley,  John N.
Atmospheric Chemistry, Max Planck Institute for Chemistry, Max Planck Society;

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Citation

Eger, P. G., Helleis, F., Schuster, G., Phillips, G. J., Lelieveld, J., & Crowley, J. N. (2019). Chemical ionization quadrupole mass spectrometer with an electrical discharge ion source for atmospheric trace gas measurement. Atmospheric Measurement Techniques, 12(3), 1935-1954. doi:10.5194/amt-12-1935-2019.


Cite as: https://hdl.handle.net/21.11116/0000-0003-EBDA-F
Abstract
We present a chemical ionization quadrupole mass spectrometer (CI-QMS) with a radio-frequency (RF) discharge ion source through N2∕CH3I as a source of primary ions. In addition to the expected detection of PAN, peracetic acid (PAA) and ClNO2 through well-established ion–molecule reactions with I− and its water cluster, the instrument is also sensitive to SO2, HCl and acetic acid (CH3C(O)OH) through additional ion chemistry unique to our ion source. We present ionization schemes for detection of SO2, HCl and acetic acid along with illustrative datasets from three different field campaigns underlining the potential of the CI-QMS with an RF discharge ion source as an alternative to 210Po. The additional sensitivity to SO2 and HCl makes the CI-QMS suitable for investigating the role of sulfur and chlorine chemistry in the polluted marine and coastal boundary layer.