OH-Initiated Photooxidation of Gas-Phase Atmospherically Relevant Monoterpene-Derived Organic Nitrates.

ABSTRACT: Monoterpene-derived organic nitrates (MT-ONs) can influence NO_x recycling, secondary organic aerosol, and ozone formation. While OH-initiated photooxidation is considered a sink for MT-ONs, the rate constants and mechanisms remain poorly constrained. We investigate the gas phase photooxidation of three synthetic ONs derived from α-pinene, β-pinene, and d-limonene (3°_ApHN, 1°_BpHN, and 2°_LmHN) through chamber experiments. The photooxidation rate constants for MT-ONs range from (5.7 ± 0.5) to (11.0 ± 1.5) × 10^-11 cm³ molecule^-1 s^-1, with corresponding lifetimes of 1.7-3.2 h under ambient OH concentrations. If we consider that products without a nitrooxy group (CHO) represent MT-ONs undergoing photooxidation to form NO_x</

SUBMITTER: Wang Y 

PROVIDER: S-EPMC12810238 | biostudies-literature | 2026 Jan

REPOSITORIES: biostudies-literature