Wavelength-resolved quantum yields for vanillin photochemistry: self-reaction and ionic-strength implications for wildfire brown carbon lifetime

Drozd, Greg T.; Weltzin, Tate; Skiffington, Samuel; Lee, Dong; Valiev, Rashid; Kurtén, Theo; Madison, Lindsey R.; He, Yiheng; Gargano, Lydia

doi:10.1039/d4ea00002a

Cited by 1 publication

(2 citation statements)

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“…The uncertainties displayed correspond to one standard deviation of the three replicates. Furthermore, the linear flux assumption is made considering the equation described by Drozd et al, where the intensity is shown to affect the rate constant proportionally …”

Section: Experiments and Methodsmentioning

confidence: 99%

“…Furthermore, the linear flux assumption is made considering the equation described by Drozd et al, where the intensity is shown to affect the rate constant proportionally. 43 Chemical Characterization. To perform the chemical characterization, two sets of experiments, i.e., 10 and 600 bar, were performed and analyzed after 3 h 30 min by UHPLC-DAD-ESI(±)-Orbitrap-MS.…”

Section: Experimental Setup and Sample Pressurizationmentioning

confidence: 99%

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The High Pressure Inside Aerosol Particles Enhances Photochemical Reactions of Biomass Burning Compounds

Dubois,

Perrier,

George

et al. 2024

ACS Earth Space Chem.

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Ultrafine aerosols (d < 100 nm) are the most abundant particles in the atmosphere with strong implications for climate and air quality. Their formation and evolution remain a subject of significant uncertainty. Recently, the implication of a fundamental and hitherto unconsidered characteristic of ultrafine aerosols has been highlighted: the Young−Laplace pressure. Here, the photochemical reaction of vanillin, a proxy for biomass burning compounds, under various high pressures was investigated. Using high-resolution mass spectrometry and UV−visible spectroscopy, we demonstrated that vanillin photodegradation was faster by ∼40% under high pressures typical of atmospheric nanoparticles. Chemical characterization shows that dimer formation, ring-opening, and cleavage processes were greatly favored (i.e., up to ∼250%) at high pressures. While the formation of light-absorbing compounds appears to be nonaffected, their decomposition through photooxidative processes was shown to be 50% faster at high pressures. This study establishes that the high pressure inside nanometric-sized aerosols has to be considered as a key property that can significantly impact photochemical processes involved in aerosol growth and aging.

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Section: Experiments and Methodsmentioning

confidence: 99%

Section: Experimental Setup and Sample Pressurizationmentioning

confidence: 99%

The High Pressure Inside Aerosol Particles Enhances Photochemical Reactions of Biomass Burning Compounds

Dubois,

Perrier,

George

et al. 2024

ACS Earth Space Chem.

View full text Add to dashboard Cite

show abstract

Wavelength-resolved quantum yields for vanillin photochemistry: self-reaction and ionic-strength implications for wildfire brown carbon lifetime

Abstract: The light absorbing content of organic aerosol, brown carbon (BrC), directly affects climate and can play a role in the oxidative aging of organic aerosol. Recent estimates suggest that globally...

Cited by 1 publication

References 60 publications

The High Pressure Inside Aerosol Particles Enhances Photochemical Reactions of Biomass Burning Compounds

The High Pressure Inside Aerosol Particles Enhances Photochemical Reactions of Biomass Burning Compounds

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