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| 冰雪表面HNO3的紫外光解机理 | |
| 引用本文： | 朱承驻,陆军,朱蕾.冰雪表面HNO3的紫外光解机理[J].环境化学,2012,31(4):528-532. |
| 作者姓名： | 朱承驻 陆军 朱蕾 |
| 作者单位： | 1. 合肥工业大学资源与环境工程学院,合肥,230009 2. 合肥工业大学分析测试中心,合肥,230009 3. Wadsworth Center, New York State Department of Health, Albany, New York 12201-0509 |
| 基金项目： | 国家自然科学基金资助项目 |
| 摘 要： | 利用308 nm激光与cavity ring-down spectroscopy技术对HNO3的气相与冰表面光解进行了研究,考察了其光解量子产额与吸收系数,结果表明,.OH+NO2*是其光解反应的主要通道;HNO3在253 K、308 nm冰表面的吸收系数为(1.21±0.31)×10-18cm2.molecule-1,比其在气相的吸收系数(1.24±0.19)×10-21 cm.2molecule-1(295 K)及(8.50±0.24)×10-22cm.2molecule-1(253 K)均高约3个数量级;HNO3在253K冰表面光解产生NO2*的量子产额为0.60±0.34. |
| 关 键 词： | HNO3 冰表面 紫外光解 量子产额 吸收系数 |
UV photolysis of HNO_3 on the ice film |
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| ZHU Chengzhu,LU Jun,ZHU Lei.UV photolysis of HNO_3 on the ice film[J].Environmental Chemistry,2012,31(4):528-532. | |
| Authors: | ZHU Chengzhu LU Jun ZHU Lei |
| Institution: | 1.School of Resources & Environmental Engineering,Hefei University of Technology,Hefei,230009,China; 2.Center of Analysis and Measurement,Hefei University of Technology,Hefei,230009,China; 3.Wadsworth Center,New York State Department of Health,Albany,New York,12201-0509) |
| Abstract: | Photolysis of nitric acid(HNO3) in the gas phase at 253 K and 295 K,on ice films at 253 K,was studied by using 308 nm excimer laser photolysis combined with cavity ring-down spectroscopy.The NO2* quantum yield and absorption cross section were directly measured.The results showed NO2* +· OH is a predominant photolysis pathway for the gas-phase photolysis of HNO3 at 308 nm.The 308 nm absorption cross section of HNO3 on ice films is(1.21±0.31)×10-18 cm2 · molecule-1 at 253 K which is about 3 orders of magnitude larger than its gas-phase cross section value of(1.24±0.19)×10-21 cm2 · molecule-1 at 295 K and(8.50±0.24) ×10-22 cm2 · molecule-1 at 253 K.The NO2* quantum yield from the HNO3 photolysis on ice films is 0.60±0.34 at 253 K. |
| Keywords: | HNO3 on the ice film UV photolysis quantum yield absorption cross sections |
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