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题名: Photofragment Imaging of HNCO decomposition at 210 nm: the primary NH(a(1)Delta)+CO(X-1 Sigma(+)) channel
作者: Wang, Hua;  Liu, Shi-Lin;  Liu, Jie;  Wang, Feng-Yan;  Jiang, Be;  Yang, Xue-Ming
关键词: isocyanic acid ;  dissociation dynamics ;  velocity slice imaging ;  dissociation energy ;  fragment angular distribution ;  translational energy distribution
刊名: CHINESE JOURNAL OF CHEMICAL PHYSICS
发表日期: 2007-08-27
DOI: 10.1088/1674-0068/20/04/388-394
卷: 20, 期:4, 页:388-394
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Physics, Atomic, Molecular & Chemical
研究领域[WOS]: Physics
英文摘要: The photodissociation of isocyanic acid (HNCO) on the first excited singlet state following the excitation at 210 nm was investigated with an ion velocity slice imaging technique by probing the GO fragment. It was found from the (2+1) resonance-enhanced multi-photon ionization (REMPI) spectrum that the CO fragments are rotationally hot with population up to J(max)=50. The velocity imagings of the GO fragments at J(CO)=30 and 35 indicate that formation of NH(alpha(1)Delta)+CO((XE+)-E-1, upsilon=0) is the predominant dissociation channel at 210 urn. From analysis of the GO fragment translational energy distributions, the NH(alpha(1 Delta)) fragment was observed to be rotationally cold, about half of the available energy was partitioned into the translational motion of fragments after dissociation, and the NH(alpha(1)Delta)+CO(X-1 Sigma(+)) dissociation threshold was determined at 42738 +/- 30 cm(-1). From analysis of the CO fragment angular distributions, the dissociation anisotropy parameter beta was found to be negative, and increasing with the rotational quantum number of the NH fragment, i.e., from -0.75 at J(NH)=2-4 to -0.17 at J(NH)=11. Impulsive direct and vertical dissociation process of HNCO on the singlet state at 210 nm was confirmed experimentally. A classical impact dissociation model was employed to explain the dependence of the beta value on the rotational excitation of the NH fragment.
关键词[WOS]: POTENTIAL-ENERGY SURFACE ;  ISOCYANIC ACID HNCO ;  PHOTODISSOCIATION DYNAMICS ;  KETENE PHOTODISSOCIATION ;  CORRELATED DISTRIBUTIONS ;  STATE DISTRIBUTIONS ;  INTERNAL-CONVERSION ;  ANGULAR ANISOTROPY ;  AB-INITIO ;  ION
语种: 英语
WOS记录号: WOS:000249465100010
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/140664
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Univ Sci & Technol China, Dept Chem Phys, Hefei Natl Lab Phys Sci Microscale, Hefei 230026, Peoples R China
2.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Mol React Dynam, Dalian 116023, Peoples R China

Recommended Citation:
Wang, Hua,Liu, Shi-Lin,Liu, Jie,et al. Photofragment Imaging of HNCO decomposition at 210 nm: the primary NH(a(1)Delta)+CO(X-1 Sigma(+)) channel[J]. CHINESE JOURNAL OF CHEMICAL PHYSICS,2007,20(4):388-394.
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