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Dataset results
5 results for “aerosol mass spectrometer”
Dataset for the refractory aerosol thermal desorption mass spectrometer (rTDMS)
<p>A particle mass spectrometer to quantify non-refractory and refractory aerosols (referred to as refractory aerosol thermal desorption mass spectrometer: rTDMS) has been developed. The combination of a graphite particle collector and a carbon dioxide laser enables high desorption temperature. Ion signals originating from evolved gas molecules are detected by a quadrupole mass spectrometer.</p>
Dataset for "Constraining the response factors of an extractive electrospray ionization mass spectrometer for near-molecular aerosol speciation"
<p>Online characterization of aerosol composition at the near-molecular level is key to understanding chemical reaction mechanisms, kinetics, and sources under various atmospheric conditions. The recently developed extractive electrospray ionization time-of-flight mass spectrometer (EESI-TOF) is capable of detecting a wide range of organic oxidation products in the particle phase in real time with minimal fragmentation. Quantification can sometimes be hindered by a lack of available commercial standards for aerosol constituents, however. Good correlations between the EESI-TOF and other aerosol speciation techniques have been reported, though no attempts have yet been made to parameterize the EESI-TOF response factor for different chemical species. Here, we report the first parameterization of the EESI-TOF response factor for secondary organic aerosol (SOA) at the near-molecular level based on their elemental composition. SOA was formed by ozonolysis of monoterpenes or OH-oxidation of aromatics inside an oxidation flow reactor (OFR) using ammonium nitrate as seed particles. A Vocus proton-transfer reaction mass spectrometer (Vocus-PTR) and a high-resolution aerosol mass spectrometer (AMS) were used to determine the gas phase molecular composition and the particle phase bulk chemical composition, respectively. The EESI response factors towards bulk SOA coating and the inorganic seed particle core were constrained by intercomparison with the AMS. The highest bulk EESI response factor was observed for SOA produced from 1,3,5-trimethylbenzene, followed by those produced from <em>d</em>-limonene and <em>o</em>-cresol, consistent with previous findings. The near-molecular EESI response factors were derived from intercomparisons with Vocus-PTR measurements, and were found to vary from 10<sup>3</sup> to 10<sup>6</sup> ions s<sup>-1</sup> ppb<sup>-1</sup>, mostly within ±1 order of magnitude of their geometric mean of 10<sup>4.6</sup> ions s<sup>-1</sup> ppb<sup>-1</sup>. For aromatic SOA components, the EESI response factors correlated with molecular weight and oxygen content, and inversely correlated with volatility. The near-molecular response factors mostly agreed within a factor of 20 for isomers observed across the aromatics and biogenic systems. Parameterization of the near-molecular response factors based on the measured elemental formulae could reproduce the empirically determined response factor for a single VOC system to within a factor of 5 for the configuration of our mass spectrometers. The results demonstrate that standard-free quantification using EESI-TOF is possible. </p>
ATom: L2 Measurements from CU High-Resolution Aerosol Mass Spectrometer (HR-AMS)
This dataset provides the atmospheric concentrations of separated ions from inorganic and organic species measured by the High-Resolution Aerosol Mass Spectrometer (HR-AMS) collected during flights of the NASA ATom Mission. Data are available from all four ATom Campaigns. The HR-AMS detects non-refractory submicron aerosol composition by impaction on a vaporizer at 600 degrees C, followed by electron ionization and time-of-flight mass spectral analysis. The measurements include chemically speciated submicron non-refractory particulate mass at a one second and 60 second resolution, and the size distribution of chemically speciated submicron non-refractory particulate mass at 60 second resolution.
ATom: L2 Particulate Iodine from High-Resolution Aerosol Mass Spectrometer (HR-AMS)
This dataset provides mass concentrations of particulate iodine as measured by the High-Resolution Aerosol Mass Spectrometer (HR-AMS) during the first two deployments of the NASA Atmospheric Tomography airborne missions (ATom-1 and ATom-2) in 2016 and 2017, respectively. The data provided in this dataset result from a reanalysis of the initial HR-AMS data based on post-mission calibrations and are reported at 1-minute resolution. The dataset also includes the fractions of the main ions (I+, HI+, and I2+) that can be used to ascertain the oxidation state of iodine in particles. Each observation includes an air mass classification flag (tropospheric or stratospheric conditions) based on collocated in situ water vapor and ozone measurements and positional data from the HR-AMS data feed.
Data: The Effect of the Averaging Period for PMF Analysis of Aerosol Mass Spectrometer Measurements during Off-Line Applications, Aerosol Measurement Techniques (AMT)
<p>File "FactorTimeSeries_AllTimeRes.xlsx" contains the time series of each factor derived from the PMF analysis for every time resolution tested in the paper.</p> <p>File "FactorSpectra_AllTimeRes.xlsx" contains the organic mass spectra of each factor derived from the PMF analysis for the different time resolutions that were tested in the paper.</p>
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OpenNeuro
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