Work

Criegee + HONO reaction: a bimolecular sink of Criegee, and the missing non-photolytic source of OH •

Year: 2025

Type: article

Abstract: . One of the most important puzzles in atmospheric chemistry is a mismatch between observed and modeled concentrations of OH•/HO•2 in the presence of high concentrations of volatile organic compounds. It is now well established that to fulfill this gap, one needs a reaction that is not only capable of producing OH• but also able to act as a sink of HO•2. In the present work, we are proposing the Criegee + HONO reaction as a possible solution of this puzzle. Our quantum chemical and kinetic calculations clearly suggest that this reaction can not only be an important source of OH radicals but can also act as a sink of HO2 radicals. Our study also suggests that HONO has the potential to become the most dominant sink of CI surpasses SO2 and water dimer, even in highly humid conditions.

Source: Atmospheric chemistry and physics

DOI: 10.5194/acp-25-16713-2025

Authors: Vishva Jeet Anand, Philips Kumar Rai, Pradeep Kumar

Institution: Malaviya National Institute of Technology Jaipur

Language: English

Topic: Atmospheric chemistry and aerosols

Subfield: Atmospheric Science

Field: Earth and Planetary Sciences

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $1,725

Funders: Department of Science and Technology, Ministry of Science and Technology, India, Malaviya National Institute of Technology, Jaipur, Science and Engineering Research Board