The effects of molecular weight and thermal decomposition on the sensitivity of a thermal desorption aerosol mass spectrometer

Murphy, D. M.

doi:10.1080/02786826.2015.1136403

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The effects of molecular weight and thermal decomposition on the sensitivity of a thermal desorption aerosol mass spectrometer

2016
By Murphy, D. M.
Source: Aerosol Science and Technology, 50:2, 118-125, 2016

[PDF-888.98 KB]

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Journal Title:

Aerosol Science and Technology
Personal Author:

Murphy, D. M.
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research) ; ESRL (Earth System Research Laboratory) ; CSL (Chemical Sciences Laboratory)

OAR (Oceanic and Atmospheric Research) ; ESRL (Earth System Research Laboratory) ; CSL (Chemical Sciences Laboratory) Less -
Description:

In free molecular flow the slower speed of heavier molecules means that they spend more time in the ion source of a mass spectrometer. Hence the sensitivity of the thermal desorption mass spectrometers such as the Aerodyne Aerosol Mass Spectrometer (AMS) should include a term that scales as the square root of the molecular weight. Thermal decomposition on the vaporizer reduces the molecular weight prior to ionization and changes electron impact cross-sections. Thermal decomposition therefore has the potential to change the sensitivity, in some cases by more than a factor of three. Current AMS calibrations that rely upon an ammonium nitrate calibration and scaling for other components with a relative ionization efficiency may overestimate the concentration of large, thermally stable molecules and underestimate small or thermally unstable molecules. The overall sensitivity of the AMS to organics includes a partial cancellation of these effects. There is an incomplete understanding of the vaporization process, including that of ammonium nitrate.
Keywords:

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Aerosols Mass Spectrometry Remote Sensing
Source:

Aerosol Science and Technology, 50:2, 118-125, 2016
DOI:

https://doi.org/10.1080/02786826.2015.1136403
Document Type:

Journal Article
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Public Domain
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Submitted
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urn:sha256:d43eebce5a53ff1444df191dd1892803e3cb6cf0f717d15631b44260a563f556
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https://repository.library.noaa.gov/view/noaa/27206/noaa_27206_DS1.pdf
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The effects of molecular weight and thermal decomposition on the sensitivity of a thermal desorption aerosol mass spectrometer

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