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Updated: Jun 13, 2025

Detection of Nitric Oxide and Superoxide Radical Anion by Electron Paramagnetic Resonance Spectroscopy from Cells using Spin Traps
Published on: August 18, 2012
Enhanced Organic Nitrate Formation from Peroxy Radicals in the Condensed Phase.
Victoria P Barber1, Lexy N LeMar2, Yaowei Li3
1Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States.
Organic alkoxy (RO) and peroxy (RO2) radicals are crucial in atmospheric chemistry. This study reveals condensed-phase reactions significantly alter product yields and atmospheric implications.
Area of Science:
- Atmospheric chemistry
- Chemical kinetics
- Environmental science
Background:
- Organic alkoxy (RO) and peroxy (RO2) radicals are key intermediates in atmospheric oxidation.
- Most research has focused on gas-phase radical chemistry, neglecting multiphase influences.
- Understanding phase-dependent chemistry is vital for accurate atmospheric models.
Purpose of the Study:
- To investigate the phase-dependent chemistry of the 1-pentoxy radical.
- To compare radical reaction pathways in aqueous, condensed organic, and gas phases.
- To elucidate the impact of phase on product formation and atmospheric implications.
Main Methods:
- Generated 1-pentoxy radicals via photolysis of n-pentyl nitrite.
- Studied reactions under conditions where RO2 radicals react with NO.
- Utilized ammonium chemical ionization mass spectrometry (NH4+ CIMS) for real-time product detection.
Main Results:
- Condensed-phase reactions showed increased organic nitrate (RONO2) formation, attributed to RO2-NO complex stabilization.
- Observed enhanced carbonyl product yields relative to hydroxy carbonyls in condensed phase, indicating altered RO radical kinetics.
- Phase-dependent branching ratios influenced product volatility and HOx-NOx chemistry.
Conclusions:
- Condensed-phase chemistry significantly alters organic radical reaction pathways and product distributions.
- Findings have implications for atmospheric nitrate formation, aerosol composition, and radical cycling in particles and droplets.
- Highlights the importance of considering multiphase chemistry in atmospheric oxidation studies.
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