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题名: Forward scattering due to slow-down of the intermediate in the H+HD -> D+H-2 reaction
作者: Harich, SA;  Dai, DX;  Wang, CC;  Yang, XM;  Chao, SD;  Skodje, RT
刊名: NATURE
发表日期: 2002-09-19
卷: 419, 期:6904, 页:281-284
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology
类目[WOS]: Multidisciplinary Sciences
研究领域[WOS]: Science & Technology - Other Topics
英文摘要: Quantum dynamical processes near the energy barrier that separates reactants from products influence the detailed mechanism by which elementary chemical reactions occur. In fact, these processes can change the product scattering behaviour from that expected from simple collision considerations, as seen in the two classical reactions F + H-2 --> HF + H and H + H-2 --> H-2 + H and their isotopic variants. In the case of the F + HD reaction, the role of a quantized trapped Feshbach resonance state had been directly determined(1), confirming previous conclusions(2) that Feshbach resonances cause state-specific forward scattering of product molecules. Forward scattering has also been observed in the H + D-2 --> HD + D reaction(3,4) and attributed to a time-delayed mechanism(3,5-7). But despite extensive experimental(8-12) and theoretical(13-18) investigations, the details of the mechanism remain unclear. Here we present crossed-beam scattering experiments and quantum calculations on the H + HD --> H-2 + D reaction. We find that the motion of the system along the reaction coordinate slows down as it approaches the top of the reaction barrier, thereby allowing vibrations perpendicular to the reaction coordinate and forward scattering. The reaction thus proceeds, as previously suggested(7), through a well-defined 'quantized bottleneck state' different from the trapped Feshbach resonance states observed before.
关键词[WOS]: DIFFERENTIAL CROSS-SECTIONS ;  TRANSITION-STATE ;  THEORETICAL PREDICTIONS ;  SPECTRAL QUANTIZATION ;  H+D-2->HD+D REACTION ;  DYNAMICS ;  RESONANCES ;  D+H2->HD+H
语种: 英语
WOS记录号: WOS:000178056300040
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/139057
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.Acad Sinica, Inst Atom & Mol Sci, Taipei, Taiwan
2.Chinese Acad Sci, Dalian Inst Chem Phys, Dalian, Peoples R China
3.Natl Taiwan Univ, Dept Chem, Taipei 10764, Taiwan
4.Natl Tsing Hua Univ, Dept Chem, Hsinchu, Taiwan
5.Inst Mol Sci, Okazaki, Aichi 4448585, Japan
6.Univ Colorado, Dept Chem & Biochem, Boulder, CO 80309 USA

Recommended Citation:
Harich, SA,Dai, DX,Wang, CC,et al. Forward scattering due to slow-down of the intermediate in the H+HD -> D+H-2 reaction[J]. NATURE,2002,419(6904):281-284.
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