AI Article Synopsis
- Recent experiments show that excited NO can react with water to form HONO and OH, although this reaction occurs very slowly in the gas phase.
- Ab initio molecular dynamics simulations indicate that when NO is on the air-water interface, the production rate of OH radicals is significantly higher—up to 100 times more than in the gas phase.
- This suggests that cloud chemistry may contribute notably to OH radical formation in the troposphere, highlighting the need for further research in laboratory settings.
Article Abstract
The atmospheric role of photochemical processes involving NO beyond its dissociation limit (398 nm) is controversial. Recent experiments have confirmed that excited NO beyond 420 nm reacts with water according to NO +H O→HONO+OH. However, the estimated kinetic constant for this process in the gas phase is quite small (k≈10 -3.4×10 cm molecule s ) suggesting minor atmospheric implications of the formed radicals. In this work, ab initio molecular dynamics simulations of NO adsorbed at the air-water interface reveal that the OH production rate increases by about 2 orders of magnitude with respect to gas phase, attaining ozone reference values for NO concentrations corresponding to slightly polluted rural areas. This finding substantiates the argument that chemistry on clouds can be an additional source of OH radicals in the troposphere and suggests directions for future laboratory experimental studies.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1002/chem.201902769 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!