溶剂化
化学
硝酸盐
雪
溶剂化壳
光解
吸收(声学)
吸收光谱法
分子间力
化学物理
光化学
离子
分析化学(期刊)
环境化学
分子
材料科学
气象学
有机化学
光学
物理
复合材料
作者
Margaret L. Berrens,Zekun Chen,Katherine Watt Chan,Cort Anastasio,Davide Donadio
出处
期刊:ACS earth and space chemistry
[American Chemical Society]
日期:2023-08-23
卷期号:7 (9): 1761-1769
标识
DOI:10.1021/acsearthspacechem.3c00127
摘要
Nitrate is a significant contaminant in Polar snow. Its photolysis in environmental sunlight generates reactive nitrogen, which impacts the oxidative capacity of the atmosphere, influencing the fate and lifetimes of pollutants. The photolysis of nitrate can produce either NO2 or NO2–, with recent experiments suggesting that the process is accelerated at the air–ice interface compared to the bulk solution. In this study, we employed a multiscale modeling approach to investigate the enhanced photoreactivity of nitrate at the ice surface in the presence of two different cations. We characterized the solvation shell of NO3– and explored its pairing with cations in water and ice using ab initio molecular dynamics and enhanced sampling. Molecular trajectories were used to calculate light absorption spectra at different solvation conditions and finite temperature. Our analysis revealed that the pairing of nitrate with cations may alter the molar absorption coefficient of nitrate at the air–ice interface affecting the rate of photolysis observed in experiments of ammonium nitrate deposited on snow.
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