Fast atom bombardment mass spectra of low molecular weight alcohols and other compounds. Evidence for a chemical ionization process in the gas phase

1988 ◽  
Vol 2 (1) ◽  
pp. 21-23 ◽  
Author(s):  
Robert T. Rosen ◽  
Thomas G. Hartman ◽  
Joseph D. Rosen ◽  
Chi-Tang Ho ◽  
H. Budzikiewicz
Keyword(s):  
Molecular Weight ◽  
Gas Phase ◽  
Mass Spectra ◽  
Chemical Ionization ◽  
Fast Atom Bombardment ◽  
Ionization Process ◽  
Low Molecular Weight

scholarly journals Distributions and sources of low-molecular-weight monocarboxylic acids in gas and particles from a deciduous broadleaf forest in northern Japan

2019 ◽  
Vol 19 (4) ◽  
pp. 2421-2432 ◽  
Author(s):  
Tomoki Mochizuki ◽  
Kimitaka Kawamura ◽  
Yuzo Miyazaki ◽  
Bhagawati Kunwar ◽  
Suresh Kumar Reddy Boreddy
Keyword(s):  
Molecular Weight ◽  
Gas Phase ◽  
Nonanoic Acid ◽  
Low Molecular Weight ◽  
Forest Site ◽  
Particle Phase ◽  
Broadleaf Forest ◽  
Monocarboxylic Acids ◽  
Deciduous Broadleaf Forest ◽  
Northern Japan

Abstract. To better understand the distributions and sources of low-molecular-weight (LMW) monocarboxylic acids (monoacids) in the forest atmosphere, we conducted simultaneous collection of gaseous and particulate samples at a deciduous broadleaf forest site in northern Japan. LMW normal (C1–C10), branched (iC4–iC6), hydroxyl (glycolic and lactic) and aromatic (benzoic) monoacids were detected in the gas and particle phases. The dominant LMW monoacids in gas phase were formic (mean: 953 ng m−3) and acetic (528 ng m−3) acids followed by propionic (37 ng m−3) or isopentanoic (42 ng m−3) acid. In the particle phase, isopentanoic (159 ng m−3) was dominant, followed by acetic (104 ng m−3) and formic (71 ng m−3) or lactic (65 ng m−3) acids. Concentrations of LMW monoacids did not show correlations with anthropogenic tracers such as nss-SO42- and NO3-, indicating that anthropogenic contribution is not important. Concentrations of C1–C6 monoacids in the gas phase showed positive correlations (r2=0.21–0.91) with isobutyric acid (iC4), which may be produced by microbial activity in soil. The forest soil may be a source of gaseous C1–C6 monoacids in the forest atmosphere. Acetic acid in the particle phase positively correlated with nonanoic acid (C9) (r2=0.63), suggesting that formation of acetic and nonanoic acids is associated with the oxidation of biogenic unsaturated fatty acids in the aerosol phase, in addition to photochemical oxidation of biogenic volatile organic compounds. The particle-phase fractions (Fp) of formic and acetic acids showed negative correlation with ambient temperature (C1: r2=0.49, C2: r2=0.60) but showed positive correlation with relative humidity (C1: r2=0.30, C2: r2=0.55) in daytime, suggesting that these meteorological parameters are important for the gas and particle portioning of monoacids in the forest atmosphere.

Chemical ionization and fast atom bombardment mass spectra of 1-hetero-aryl-silatranes and -germatranes

1990 ◽  
Vol 384 (3) ◽  
pp. 257-261 ◽  
Author(s):  
S. Rozite ◽  
I. Maẑeika ◽  
A. Gaukhman ◽  
N.P. Erchak ◽  
L.M. Ignatovich ◽  
...  
Keyword(s):  
Mass Spectra ◽  
Chemical Ionization ◽  
Fast Atom Bombardment

Thermal Profiles in Gas Phase Oxidations of Low Molecular Weight Hydrocarbons

Nature ◽  
1966 ◽  
Vol 212 (5064) ◽  
pp. 812-813
Author(s):  
J. F. BUSSERT ◽  
E. F. STEIGELMANN
Keyword(s):  
Molecular Weight ◽  
Gas Phase ◽  
Low Molecular Weight

The electron impact, chemical ionization and fast atom bombardment positive ion mass spectra of 1,2-bis(sulfonyl)methylhydrazines

1991 ◽  
Vol 20 (11) ◽  
pp. 693-698 ◽  
Author(s):  
Giuseppe Giordano ◽  
Glenn Peterson ◽  
Walter J. McMurray ◽  
Shyam Krishnamurthy ◽  
Alan C. Sartorelli
Keyword(s):  
Electron Impact ◽  
Mass Spectra ◽  
Chemical Ionization ◽  
Fast Atom Bombardment ◽  
Positive Ion
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