Publications by authors named "S Enami"
The air-water interface (AWI) is a ubiquitous reaction field different from the bulk phase where unexpected reactions and physical processes often occur. The AWI is a region where air contacts cloud droplets, aerosol particles, the ocean surface, and biological surfaces such as fluids that line human epithelia. In Earth's atmosphere, short-lived intermediates are expected to be generated at the AWI during multiphase reactions.
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- Saturated fatty acids are common in oceans and contribute to the formation of volatile organic compounds through photochemical reactions driven by sunlight.
- A long-standing mystery about their ability to absorb light beyond 250 nanometers has been clarified, revealing that this absorption is actually due to tiny impurities in the nonanoic acid.
- New measurements show that the photolysis rate of nonanoic acid is significantly lower, by three to five orders of magnitude, compared to other important carbonyl compounds in the atmosphere.
Levoglucosan (Levo) is a major saccharide formed by the combustion of cellulosic materials. Levo was once considered an inert tracer of biomass-burning aerosols; however, recent studies have indicated that Levo in atmospheric condensed phases does indeed react with atmospheric reactants. Here, we report the results of a time-resolved mass spectrometric study of the oxidation of Levo in aqueous solutions with ferrous ion (Fe)/hydrogen peroxide (HO) (i.
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- UV photolysis of fatty acid surfactants, such as nonanoic acid, is suggested to produce hydroxyl (OH) radicals in the troposphere, impacting atmospheric chemistry.
- Using laser-induced fluorescence, researchers directly observed the desorption of OH radicals from liquid nonanoic acid when exposed to 213 nm light.
- The study estimated the photoreaction cross section for OH desorption to be very low compared to gas-phase acetic acid and noted that the dimer structure of nonanoic acid at the liquid surface may hinder OH radical formation.
1,2,4-Trioxolanes, known as secondary ozonides (SOZs), are key products of ozonolysis of biogenic terpenoids. Functionalized terpenoid-derived SOZs are readily taken up into atmospheric aerosols; however, their condensed-phase fates remain unknown. Here, we report the results of a time-dependent mass spectrometric investigation into the liquid-phase fates of C and C SOZs synthesized by ozonolysis of a C monoterpene alcohol (α-terpineol) in water:acetone (1:1 = vol:vol) mixtures.
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