DICP OpenIR
Subject Area物理化学
Reactivity Inhibitation by Antisymmetric Stretching Excitation in Dual-mechanism Reaction O(1D)+CH4
Pan HL(潘慧琳); Shuai Q(帅全); Yang JY(杨家岳); Zhang D(张冬); Jiang B(姜波); Dai DX(戴东旭); Yang XM(杨学明)
Source PublicationConference on Molecular Energy Transfer 2011 Book of abstracts
Conference NameInternational Conference on Molecular Energy Transfer 2011
Conference Date2011-09-11
2011
Conference Place牛津
Alternative TitleCH4的非对称伸缩振动激发对双重机理反应O(1D)+CH4反应性的抑制
Pages71-0
Publisher待补充
Publication Place待补充
Cooperation Status墙报
Department1102
Funding Organization英国牛津大学
AbstractDifferent forms of energy play distinct roles in chemical reactions1. How does the additional vibrational energy of the reactant work along the reaction coordinate? This problem is extremely important in understanding details of reaction dynamics. Accordingly, we performed a series of cross-beam experiments of the dual-mechanism reaction O(1D)+CH4(ν3=0, 1)→OH+CH3, on a newly-built time-sliced ion velocity imaging machine2 at collision energies ranging from 3.23 to 6.70 kcal/mol. One of the reaction products CH3 was state-selectively detected using a (2+1) resonance-enhanced multiphoton ionization(REMPI) technique3. To everyone’s surprise, channels producing , , states of product CH3 were completely depleted by the reactant vibrational excitation, while the / path exposed less depletion. It means the antisymmetric stretching excitation of reactant CH4 not only exhibits no promotion to the reaction, but also restrains the rupture of the excited bond. In other words, it hinders the overall cross section of the title reaction. This finding furthers our understanding of polyatomic reactions, and requires more experimental and theoretical works on corresponding reaction dynamics.; Different forms of energy play distinct roles in chemical reactions1. How does the additional vibrational energy of the reactant work along the reaction coordinate? This problem is extremely important in understanding details of reaction dynamics. Accordingly, we performed a series of cross-beam experiments of the dual-mechanism reaction O(1D)+CH4(ν3=0, 1)→OH+CH3, on a newly-built time-sliced ion velocity imaging machine2 at collision energies ranging from 3.23 to 6.70 kcal/mol. One of the reaction products CH3 was state-selectively detected using a (2+1) resonance-enhanced multiphoton ionization(REMPI) technique3. To everyone’s surprise, channels producing , , states of product CH3 were completely depleted by the reactant vibrational excitation, while the / path exposed less depletion. It means the antisymmetric stretching excitation of reactant CH4 not only exhibits no promotion to the reaction, but also restrains the rupture of the excited bond. In other words, it hinders the overall cross section of the title reaction. This finding furthers our understanding of polyatomic reactions, and requires more experimental and theoretical works on corresponding reaction dynamics.
Document Type会议论文
Identifierhttp://cas-ir.dicp.ac.cn/handle/321008/115965
Collection中国科学院大连化学物理研究所
Corresponding AuthorYang XM(杨学明)
Recommended Citation
GB/T 7714
Pan HL,Shuai Q,Yang JY,et al. Reactivity Inhibitation by Antisymmetric Stretching Excitation in Dual-mechanism Reaction O(1D)+CH4[C]. 待补充:待补充,2011:71-0.
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