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UV Photodissociation Dynamics of Nitric Acid: The Hydroxyl Elimination Channel
Feng-yan Wang,Zhi-chao Chen,Yong-wei Zhang,Quan Shuai,Bo Jiang,Dong-xu Dai,Xiu-yan Wang,Xue-ming Yang *
Author NameAffiliationE-mail
Feng-yan Wang State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China  
Zhi-chao Chen State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China  
Yong-wei Zhang State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China  
Quan Shuai State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China  
Bo Jiang State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China  
Dong-xu Dai State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China  
Xiu-yan Wang State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China  
Xue-ming Yang * State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China xmyang@dicp.ac.cn 
Abstract:
Sliced velocity mapping ion imaging technique was employed to investigate the dynamics of the hydroxyl elimination channel in the photodissociaiton of nitric acid in the ultraviolet region. The OH product was detected by (2+1) resonance enhanced multiphoton ionization via the D2∑- electronic state. The total kinetic energy spectra of the OH+NO2 channel from the photolysis of HONO2 show that both NO2(X 2A1) and NO2(? 2B2) channels are present,suggesting that both 11 A" and 21 A" excited electronic states of HONO2 are involved in the excitation. The parallel angular distributions suggest that the dissociation of the nitric acid is a fast process in comparison with the rotational period of the HNO3 molecule. The anisotropy parameter ? for the hydroxyl elimination channel is found to be dependent on the OH product rotational state as well as the photolysis energy.
Key words:  Slice imaging technique, Photodissociation dynamics, Nitric acid, OH radical,Resonance enhanced multiphoton ionization
FundProject:
UV Photodissociation Dynamics of Nitric Acid: The Hydroxyl Elimination Channel
王凤燕,陈志超,张永为,帅全,姜波,戴东旭,王秀岩,杨学明 *
摘要:
采用离子切片成像技术研究了硝酸分子在紫外区域的OH通道的光解动力学. OH产物由(2+1)共振多光子电离进行探测,共振态为D2∑-电子态. HONO2分子的解离产物OH+NO2 的总平动能谱显示NO2( X2A1)和NO2( ?2B2)两个通道均存在,这表明HONO2分子的11A"和21A"两个电子激发态均被激发. 产物的平行角分布表明相对于分子的转动周期,硝酸分子为快速解离过程. 氢氧自由基解离通道的各向异性参数值?不仅和OH产物的转动态有关,还和解离能量有关.
关键词:  离子切片成像技术,硝酸分子,光解动力学,氢氧自由基,共振多光子电离
DOI:10.1088/1674-0068/22/02/191-196
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