Photodissociation dynamics of methanol and ethanol at 157 nm

	Photodissociation dynamics of methanol and ethanol at 157 nm
	Yuan, Kai-jun; Cheng, Yuan; Wang, Feng-yan; Yang, Xue-ming
刊名	chinese journal of chemical physics
	2008-08-01
卷号	21 期号:4 页码:301-307
关键词	photodissociation dynamics H atom channel VUV photolysis
通讯作者	杨学明
产权排序	1;1
英文摘要	157 nm photodissociation of jet-cooled ch3oh and c2h5oh was studied using the high-n rydberg atom time-of-flight (tof) technique. tof spectra of nascent h atom products were measured. simulation of these spectra reveals three different atomic h loss processes: one front hydroxyl h elimination one from methyl (ethyl) h elimination, and one from secondary dissociation of the methoxy (ethoxy) radical. the relative branching ratio indicates secondary dissociation of ethoxy is less important than that of methoxy the average angular anisotropy parameter of methanol is negative (with beta approximate to-0.3), indicating the transition dipole moment is perpendicular to the c-o-h plane. the slightly more negative beta value of ethanol (with beta approximate to-0.4) implies that ethanol has a longer rotational period. these experimental results indicate that both systems undergo fast internal conversion to the 3s surface after it is excited to the 3p(x) surface, and then dissociate on the 3s surface. the translational energy distribution of the ch3oh products reveals extensive ch3 rocking or ch3 umbrella excitation in the ch3o radical. however the vibrational structures are not resolved in the c2h5o radical.
WOS标题词	science & technology ; physical sciences
类目[WOS]	physics, atomic, molecular & chemical
研究领域[WOS]	physics
关键词[WOS]	cross-sections ; spectra ; energy ; fluorescence ; photolysis ; pathways ; radicals ; product ; ch3oh
收录类别	SCI
原文出处	true
语种	英语
WOS记录号	WOS:000259288800001
公开日期	2010-11-30
内容类型	期刊论文
源URL	[http://159.226.238.44/handle/321008/101233]
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	Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Mol React Dynam, Dalian 116023, Peoples R China
推荐引用方式 GB/T 7714	Yuan, Kai-jun,Cheng, Yuan,Wang, Feng-yan,et al. Photodissociation dynamics of methanol and ethanol at 157 nm[J]. chinese journal of chemical physics,2008,21(4):301-307.
APA	Yuan, Kai-jun,Cheng, Yuan,Wang, Feng-yan,&Yang, Xue-ming.(2008).Photodissociation dynamics of methanol and ethanol at 157 nm.chinese journal of chemical physics,21(4),301-307.
MLA	Yuan, Kai-jun,et al."Photodissociation dynamics of methanol and ethanol at 157 nm".chinese journal of chemical physics 21.4(2008):301-307.