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- W4323351815 abstract "<strong class=journal-contentHeaderColor>Abstract.</strong> Highly oxygenated organic molecules (HOM) are important for the formation of secondary organic aerosol (SOA), which poses serious health risks and exerts great influence on Earth’s climate. However, the speciation of particle-phase HOM and its relationship with gas-phase HOM formation has been limited by the lack of suitable analytical techniques. Here, combining a novel particle evaporation inlet VIA (Volatilization Inlet for Aerosols) with a nitrate chemical ionization mass spectrometer (NO<sub>3</sub>-CIMS), gas- and particle-phase HOM products of α-pinene ozonolysis were studied under different conditions. Within the 50-min residence time of our Teflon chamber, we observed enhancement of C<sub>16</sub>-C<sub>19</sub> HOM dimers in particles compared to the HOM that were condensing. In particular, gas-phase dimer formation was considerably suppressed in experiments with the addition of CO or NO, but dimers still made up a considerable fraction of the observed SOA. In addition to the generally shorter carbon skeletons of the particle phase dimers (i.e. C<sub>16</sub>-C<sub>19</sub>) compared to the gas phase (C<sub>19</sub>-C<sub>20</sub>), average O / C ratios of the HOM (especially in the dimer range) also decreased slightly in the particle phase. C<sub>17</sub>H<sub>26</sub>O<sub>z</sub> compounds, which have often been reported by previous offline measurements, dominate the particle-phase HOM mass spectra in α-pinene ozonolysis experiments. Our results indicate that these C<sub>17</sub> compounds might be related to particle-phase processes within one hour after HOM condensation. However, the new VIA-NO<sub>3</sub>-CIMS system used in this work will require more detailed characterization to better understand how the thermal desorption and wall effects may modify the measured particle-phase HOM distributions. Nevertheless, for example organic nitrate measured by this novel VIA-NO<sub>3</sub>-CIMS system was consistent with the measurements of an Aerodyne Aerosol Mass Spectrometer (AMS), showing the capability of this system as a promising technique for particle-phase HOM measurements. Taken together, we believe that this system is a promising technique for combined online gas- and particle-phase HOM measurements." @default.
- W4323351815 created "2023-03-08" @default.
- W4323351815 creator A5011133976 @default.
- W4323351815 date "2023-03-07" @default.
- W4323351815 modified "2023-09-30" @default.
- W4323351815 title "Reply on RC1" @default.
- W4323351815 doi "https://doi.org/10.5194/egusphere-2022-1317-ac1" @default.
- W4323351815 hasPublicationYear "2023" @default.
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