Atmospheric Measurement Techniques
Atmospheric Measurement Techniques
AMT
Articles | Volume 18, issue 22
Articles | Volume 18, issue 22
https://doi.org/10.5194/amt-18-6979-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-18-6979-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 18, issue 22
Research article
 | 
24 Nov 2025
Research article |  | 24 Nov 2025

Laboratory and field characterization of an atmospheric pressure transverse chemical ionization ion-molecule reaction region

Phil Rund, Ben H. Lee, Siddharth Iyer, Gordon A. Novak, Jake T. Vallow, and Joel A. Thornton

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Short summary
We introduce a custom-built chamber (known as an IMR) for use with a Chemical Ionization Mass Spectrometry (CIMS) gas measurement instrument. The IMR shows large improvements compared to previous designs in reducing non-real signal in the instrument, reducing uncertainties for trace gas studies in the laboratory and the field. We characterize this new IMR and demonstrate its use in analyzing air masses of unknown composition during a field campaign, reporting concentrations of important gases.
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