本所聲明  |  聯系方式  |  中科院  |  OA  |  ARP  |  English  |  郵箱

4月27日學術報告:Low-energy stereodynamics of ion-forming reactions

來源: 發布時間:2021-04-22【字體:

  4月27日學術報告:Low-energy stereodynamics of ion-forming reactions

  報告題目:Low-energy stereodynamics of ion-forming reactions

  報告人:鄒俊文博士,瑞士洛桑聯邦理工學院(EPFL)

  報告時間:2021年4月27日(周二)上午10:00

  報告地點:溢智廳

  報告摘要:

  In this talk, an experimental study of low-temperature stereodynamics in the reactive scattering of Ne(3P2) + X collisions (X = Ar, Kr, Xe, CO and N2) will be presented. The steric effect of Ne(3P2) in these reactions is observed experimentally using a controllable magnetic field. The observations are interpreted using classical and quantum models. This study provides state-selected stereodynamics over a wide range of collision energies from 1000 K down to sub-Kelvin energies using a combination of the merged beam technique and external field manipulation.

  The key parameter to characterize the steric effect in these reactions is the branching between different possible reaction channels as a function of magnetic field direction. These branching ratios are obtained for individual states that differ only in Ω, the projection of the neon total angular momentum vector on the inter-particle axis, by using a Monte-Carlo fitting algorithm to fit an analytical expression for the relative importance of the different, state and process-specific, reaction channels to the experimental data. From the comparison of these experimental data, several interesting dynamical phenomena are found, including the reorientation effect and predissociation in atom-molecule collisions, which provides a new way to understand the reaction dynamics at low temperatures.

  Finally, we use a combination of an electrostatic hexapole and (2+1) resonance-enhanced multiphoton ionization to produce and characterize an oriented ammonia sample (ND3) using a controllable electric field, which provides a method to study stereodynamics of Ne(3P2) with oriented polar molecules.

  報告人簡介:

  鄒俊文博士在2015年及2021年分別從德國慕尼黑大學 (Ludwig Maximilian University of Munich) 和瑞士洛桑聯邦理工學院 (école Polytechnique Fédérale de Lausanne)獲得碩士和博士學位。其研究課題分別是阿秒尺度上的帶相位標記的電子動力學和離子形成反應中的低能立體動力學。鄒俊文博士的主要研究方向在低溫立體動力學。鄒俊文博士在國際期刊發表了6篇論文,其中包括Nature Chemistry, Physical Review Letters, The Journal of Chemical Physics等高引雜志。同時他參加了2次國際會議,其中在iCOMET 2019做大會報告。

  近五年發表主要文章:

  [1] Zou J., Osterwalder A. Investigation of the low-energy stereodynamics in the Ne (3P2) + N2, CO reactions. J. Chem. Phys., 2020, 153(10): 104306.

  [2] Zou J., Gordon S. D. S., Osterwalder A. Sub-Kelvin Stereodynamics of the Ne (3P2) + N2 Reaction. Phys. Rev. Lett., 2019, 123(13): 133401.

  [3] Gordon S. D. S., Omiste J. J., Zou J., et al. Quantum-state-controlled channel branching in cold Ne ( 3P2 ) + Ar chemi-ionization. Nat. Chem., 2018, 10(12): 1190 -1195.

  [4] Zou J., Gordon S. D. S., Tanteri S., et al. Stereodynamics of Ne (3P2) reacting with Ar, Kr, Xe, and N2. J. Chem. Phys., 2018, 148(16): 164310.

  [5] Gordon S. D. S., Zou J., Tanteri S., et al. Energy Dependent Stereodynamics of the Ne (3P2) + Ar Reaction. Phys. Rev. Lett., 2017, 119(5): 053001.


附件下載: