[PDF] Top 20 Constraining Anthropogenic and Biogenic Emissions using Chemical Ionization Mass Spectrometry
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Constraining Anthropogenic and Biogenic Emissions using Chemical Ionization Mass Spectrometry
... Ambient measurements are central to determining air quality compliance. Additionally, such measurements offer an opportunity to evaluate our current understanding of atmospheric processes. This thesis presents in situ ... See full document
120
Airborne intercomparison of HO xmeasurements using laser-induced fluorescence and chemical ionization mass spectrometry during ARCTAS
... when biogenic emissions dominate (Mao et al., 2012). A new chemical removal method using hexafluoro- propylene (C 3 F 6 ) to measure OH was deployed in parallel with the traditional FAGE ... See full document
13
The sensitivity of benzene cluster cation chemical ionization mass spectrometry to select biogenic terpenes
... for chemical ionization of select biogenic volatile organic ...deployable chemical ionization time-of- flight mass spectrometer (CI-ToFMS), using benzene clus- ter cation ... See full document
12
Characterization of submicron particles influenced by mixed biogenic and anthropogenic emissions using high-resolution aerosol mass spectrometry: results from CARES
... The HOA factor corresponded to primary emissions from local sources. The diurnal variation patterns of LO-OOA, ozone, and sulfate were very similar and all showed substan- tial daytime increases consistent with ... See full document
26
Constraining the sensitivity of iodide adduct chemical ionization mass spectrometry to multifunctional organic molecules using the collision limit and thermodynamic stability of iodide ion adducts
... Figure 3. Effective binding energy. Top: declustering scans of gas- phase products measured from the reaction of α-pinene in the pres- ence of ozone and NO x . Some iodide adducts dissociate rapidly during the first few ... See full document
8
Real-time measurements of gas-phase organic acids using SF6− chemical ionization mass spectrometry
... primarily biogenic in nature (Mil- let et ...direct emissions from vegetation and soil and photochemical production from bio- genic volatile organic compounds ... See full document
18
Atmospheric Reactive Trace Gas Observations in Field and Chamber Studies Using CF₃O⁻ Chemical Ionization Mass Spectrometry
... 1.1 Overview Atmospheric chemistry research encompases the study of the composition of and the chemical re- actions occurring within and at the interfaces of planetary atmospheres. For more than the past half ... See full document
296
A new technique for the direct detection of HO 2radicals using bromide chemical ionization mass spectrometry (Br-CIMS): initial characterization
... x emissions and shows a slow decrease into the evening, likely from non-photolytic pro- duction, among other ...time. Mass spectra of ambi- ent measurements showed the 79 BrHO − 2 peak was the major ... See full document
11
Airborne observations of formic acid using a chemical ionization mass spectrometer
... surface emissions from combustion ...air mass back trajectories sug- gest that direct input from primary surface sources is much ...both anthropogenic and biogenic sources ...of ... See full document
11
Using collision-induced dissociation to constrain sensitivity of ammonia chemical ionization mass spectrometry (NH4+ CIMS) to oxygenated volatile organic compounds
... other anthropogenic aromatics, by hy- droxyl (OH) radicals in an environmental ...detected using an Aero- dyne aerosol mass spectrometer (AMS; DeCarlo et ...High-resolution mass spectra of 3- ... See full document
10
Chemical ionization and collision induced dissociation mass spectrometry
... Work by Carr et a{7 showed, for peptides up to mass 2000 Daltons, that argon can be used to produce qualitatively better CID spectra than helium using an electrically floated c[r] ... See full document
123
Methods to detect volatile organic compounds using selected-ion chemical ionization mass spectrometry
... proton-transfer ionization of VOCs resulted in fragmentation of the VOC ions, any fragment ions at or near the mass-to-charge ratios of the air ions would be ejected from the mass ...the mass ... See full document
190
Gas Chromatography / Chemical Ionization Mass Spectrometry of Polyethylene Glycol Monoalkyl Ethers
... , MC 3 H 5 + ) and the base peaks as the MH + ions for all the PEGMAE he studied. In our experiment, there were no adduct ions and the base peak are the H(OC 2 H 4 ) n OH 2 + ions (n = 1 - 3). Only tetraethylene glycol ... See full document
6
Molecular diagnosis of cancer using ambient ionization mass spectrometry
... studied using ambient ionization mass spectrometry ...probe using light abrasive force on the biological ...spray mass spectra displayed in ...spray mass spectra from the ... See full document
171
Coupling Filter-Based Thermal Desorption Chemical Ionization Mass Spectrometry with Liquid Chromatography/Electrospray Ionization Mass Spectrometry for Molecular Analysis of Secondary Organic Aerosol
... American Chemical Society. 1155 Sixteenth Street N.W., Spectrometry with Liquid Chromatography/Electrospray Ionization Mass Spectrometry for Molecular Analysis of Secondary Organic ... See full document
39
Performance of a corona ion source for measurement of sulfuric acid by chemical ionization mass spectrometry
... when using CIMS for H 2 SO 4 detection – even in conjunction with a corona ion source, a device normally known for producing higher background levels of unwanted substances in compar- ison to radioactive ion ... See full document
7
Introduction of Mass Spectrometry and Ambient Ionization Techniques
... urbanization, mass industrialization, and business glob- alization, there are many serious problems, for example, resource shortage, climate change, and environment deterioration, facing the world, and therefore ... See full document
42
Electrostatic Spray Ionization Mass Spectrometry Imaging
... ESTASI MSI. The ESTASI MSI experiments were performed on an ion trap mass spectrometer (Thermo LTQ Velos, ThermoFisher Scienti fic, Reinach, Switzerland). The spray voltage of the internal power source of the MS ... See full document
9
Ionization Methods in Organic Mass Spectrometry Contents:
... negative-ion chemical ionization, a buffer gas (usually a common CI gas such as methane) is used to slow down the electrons in the electron beam until some of the electrons have just the right energy to be ... See full document
19
Clustering, methodology, and mechanistic insights into acetate chemical ionization using high-resolution time-of-flight mass spectrometry
... aerosol mass spectrometer data, suggesting that despite the complexities and unknowns, the acetate CIMS captures an important fraction of the gas- phase chemistry relevant to secondary organic aerosol pro- duction ... See full document
18
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