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HNCO在201 nm的离子成像光解动力学:CO(X1Σ+)与NH(a1Δ)
张志国*1, 辛 敏1, 吴言宁1, 赵书涛1, 唐义甲*1, 陈 旸*2
1.阜阳师范学院物理与电子工程学院,阜阳 236041;2.中国科学技术大学化学物理系,合肥微尺度物质科学国家研究中心,合肥 230026
摘要:
本文通过时间切片离子速度成像技术在201 nm附近研究了HNCO分子在S1电子激发态的光解动力学. CO产物通过共振增强多光子电离的方法进行了选态探测,获得了CO产物的振动基态和激发态切片影像. 从CO的影像得到了解离产物的能量分布和空间角分布,确定了NH(a1Δ)产物的振转态分布信息. 研究发现1NH的振动分支比(v=1/v=0)随CO(v=0)转动能的增大先增大后下降,展现了1NH与CO之间特殊的态态相关性. 大约一半的可资用能分配给解离产物的平动自由度. 负的各向异性参数表明HNCO的光解是个快速的直接解离过程.
关键词:  HNCO,离子速度成像,能量分布
DOI:10.1063/1674-0068/31/cjcp1808192
分类号:
基金项目:
Imaging HNCO Photodissociation at 201 nm: State-to-State Correlations between CO(X1Σ+) and NH(a1Δ)
Zhi-guo Zhang*1, Min Xin1, Yan-ning Wu1, Shu-tao Zhao1, Yi-jia Tang*1, Yang Chen*2
1.School of Physics and Electronic Engineering, Fuyang Normal University, Fuyang 236041, China;2.Department of Chemical Physics and Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei 230026, China
Abstract:
The NH(a1Δ)+CO(X1Σ+) product channel for the photodissociation of isocyanic acid (HNCO) on the first excited singlet state S1 has been investigated by means of time-sliced ion velocity map imaging technique at photolysis wavelengths around 201 nm. The CO product was detected through (2+1) resonance enhanced multiphoton ionization (REMPI). Images were obtained for CO products formed in the ground and vibrational excited state (v=0 and v=1). The energy distributions and product angular distributions were obtained from the CO velocity imaging. The correlated NH(a1Δ) rovibrational state distributions were determined. The vibrational branching ratio of 1NH (v=1/v=0) increases as the rotational state of CO(v=0) increases initially and decreases afterwards, which indicates a special state-tostate correlation between the 1NH and CO products. About half of the available energy was partitioned into the translational degree of freedom. The negative anisotropy parameter indicates that it is a vertical direct dissociation process.
Key words:  HNCO, Ion velocity map imaging, Energy distributions