Nonadiabatic dissociation dynamics in H2O: Competition between rotationally and nonrotationally mediated pathways

	Nonadiabatic dissociation dynamics in H2O: Competition between rotationally and nonrotationally mediated pathways
	Yuan, Kaijun 1; Cheng, Yuan 1; Cheng, Lina 1; Guo, Qing 1; Dai, Dongxu 1; Wang, Xiuyan 1; Yang, Xueming 1; Dixon, Richard N.2
刊名	proceedings of the national academy of sciences of the united states of america
	2008-12-09
卷号	105 期号:49 页码:19148-19153
关键词	photochemistry water photodissociation stereodynamics VUV photolysis
英文摘要	the photochemistry of h2o in the vuv region is important in interstellar chemistry. whereas previous studies of the photodissociation used excitation via unbound states, we have used a tunable vuv photolysis source to excite individual levels of the rotationally structured (c) over tilde state near 124 nm. the ensuing oh product state distributions were recorded by using the h-atom rydberg tagging technique. experimental results indicate a dramatic variation in the oh product state distributions and its stereodynamics for different resonant states. photodissociation of h2o((c) over tilde) in rotational states with k(a)' = 0 occurs exclusively through a newly discovered homogeneous coupling to the (a) over tilde state, leading to oh products that are vibrationally hot (up to v = 13), but rotationally cold. in contrast, for h2o in rotationally excited states with k(a)' > 0, an additional pathway opens through coriolis-type coupling to the (b) over tilde state surface. this yields extremely rotationally hot and vibrationally cold ground state oh(x) and electronically excited oh(a) products, through 2 different mechanisms. in the case of excitation via the 1(10) <- 0(00) transition the h atoms for these 2 product channels are ejected in completely different directions. quantum dynamical models for the (c) over tilde -state photodissociation clearly support this remarkable dynamical picture, providing a uniquely detailed illustration of nonadiabatic dynamics involving at least 4 electronic surfaces.
WOS标题词	science & technology
类目[WOS]	multidisciplinary sciences
研究领域[WOS]	science & technology - other topics
关键词[WOS]	multiphoton ionization spectroscopy ; oh prompt emission ; photodissociation dynamics ; molecular predissociation ; 2 comets ; water ; nm ; states ; jet ; d2o
收录类别	SCI
语种	英语
WOS记录号	WOS:000261706600025
公开日期	2015-11-17
内容类型	期刊论文
源URL	[http://159.226.238.44/handle/321008/141116]
专题	大连化学物理研究所_中国科学院大连化学物理研究所
作者单位	1.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Mol React Dynam, Dalian 116023, Peoples R China 2.Univ Bristol, Sch Chem, Bristol BS8 1TS, Avon, England
推荐引用方式 GB/T 7714	Yuan, Kaijun,Cheng, Yuan,Cheng, Lina,et al. Nonadiabatic dissociation dynamics in H2O: Competition between rotationally and nonrotationally mediated pathways[J]. proceedings of the national academy of sciences of the united states of america,2008,105(49):19148-19153.
APA	Yuan, Kaijun.,Cheng, Yuan.,Cheng, Lina.,Guo, Qing.,Dai, Dongxu.,...&Dixon, Richard N..(2008).Nonadiabatic dissociation dynamics in H2O: Competition between rotationally and nonrotationally mediated pathways.proceedings of the national academy of sciences of the united states of america,105(49),19148-19153.
MLA	Yuan, Kaijun,et al."Nonadiabatic dissociation dynamics in H2O: Competition between rotationally and nonrotationally mediated pathways".proceedings of the national academy of sciences of the united states of america 105.49(2008):19148-19153.