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Laboratory of Molecular Reaction Stereodynamics

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More About Us

Our group is affilated with Department of Chemical Physics, University of Science and Technology of China at Hefei, as well as Hefei National Laboratory for Physical Sciences at Microscale. Now we are investigating the electron-induced/driven chemical reactions in gas- and lqiuid-phases.

Current Members

Prof. Shan Xi Tian

  • Post-Doctor Jie Hu (huadie08@mail.ustc.edu.cn)
  • Post-Doctor Bin Wu (wubin@ustc.edu.cn)
  • Hao LI (D3, dali@mail.ustc.edu.cn)
  • Xiao-Fei GAO (D3, gaoxf12@mail.ustc.edu.cn)
  • Chun-Xiao WU (D2, wx7@mail.ustc.edu.cn)
  • Raziq NAWAZ (D2, raziqnawaz1@gmail.com)
  • Zi-Wei CHEN (D1, czw14@mail.ustc.edu.cn)
  • Zi-Yuan LI (M2,liziyuan@mail.ustc.edu.cn)
  • Miao-Miao HE(M2,miaohe@mail.ustc.edu.cn)
  • Xin MENG (M2,sa3015@mail.ustc.edu.cn)
  • Jing-Chen XIE(M1,xjc1997@mail.ustc.edu.cn)
  • Recently Graduated

  • 2018: Xu-Dong Wang (PhD, Top-level CAS president awardee); Jie Hu (PhD); Ling-Ling Chen (MS); Jin-Chen Xie (BS)
  • 2017: Yu-Feng Ye (MS); Zi-Yuan Li(BS)
  • 2016: Wen-Ling Feng (PhD); Meng-Yang Li (MS)
  • 2015: Chuan-Jin Xuan (MS)
  • 2014: Cen-Feng Fu (PhD); Tao Jin (BS); Qi Yu (BS); Xuejun Gong (BS)
  • 2013: Lei Xia (PhD, CAS president awardee), Zhou Zhang (MS), Xian-Jin Zeng (MS), Hong-Kai Li (MS), Meng-Yang Li (BS), Yifan Liu (BS)
  • 2012: Bin Wu (PhD); Yong-Feng Wang (PhD); Yun-Feng Xu (PhD); Fan Zhang (BS); Wen-Hao Liu (BS)
  • 2011: Liuli Chen (PhD); Sheng-Xi Jin (BS); Yu-Feng Ye (BS)
  • 2010: Hai-Bei Li (PhD); Qiang Feng (MS); Xiang-Ling Meng (BS); Jia-Xing Lin (BS), Xian-Jin Zeng (BS), Fan Zheng (BS)
  • Recent News

    May 2019

    Astrochemistry Workshop

    Presentation and Poster Prize

    On the Internationl Workshop of Astrochemistry (May 18-19, 2019, Xi'an, China), Jie Hu gave a talk 'Dynamics study of charge-exchange reactions between Ar+ and small molecules', and Chun-Xiao Wu received a poster prize. Congratulation to Chun-Xiao.

    February 2019

    DEA to Vibrationally Excited Molecule

    Li et al., Phys. Rev. A

    We completed a VMI experimental study of the DEA processes of vibrationally excited CO2 prepared with the resonant vibrational excitation by electron impact. The production efficiecny curve and the high-resolution momentum images of the O- product indicate that the rovibrational state distributions of the CO co-products depend on the vibrational modes of the target CO2.

    research

    Our Latest Projects

    Basic features of chemical reaction are inter-/intra-molecular energy and charge redistributions and molecular reconstructions. Electron- or charge-transfer process is a doorway of chemical reactions in plasma, flame, interstellar space, and solutions. Now we are interested in the following three types of electron-driven chemical reactions and the development and application of the molecular control techniques.

    Dissociative Electron Attachment

    since 2012

    Dissociative electron attachment (DEA), e- + AB -> A + B-, is a vital damage in the irradiation to biological tissues, in which more chemical bonds of a biomolecule could be broken. DEA also happens in the interstellar space and Earth's upper atmosphere because lots of low-energy free electrons (less 20 eV) exist there. The anionic and neutral fragments or radicals produced in DEA trigger sub-reactions. Therefore, this process, DEA, is a key step of electron-induced or -driven chemical reactions.

    To have the dynamics insights into above processes, we set up the unique experimental apparatuses, and the state-of-the-art technique, time-sliced anion velocity map imaging (VMI), is now combined with a trochoidal electron monochromator (TEM) in our newly developed apparatus.

    We further introduce the laser-induced fluorescence (LIF) and resonance-enhanced multiphoton ionization (REMPI) techiques into this new VMI apparatus, then we can study the novel radicals (neutral and anionic) produced in DEA, in particular,those in the intersellar space and atmosphere.

    Ion-Molecule Reaction

    since 2017

    Positive/negative charge transfer can happen in the low-energy ion reaction with atom or molecule, where the energy redistributions occur simultaneously in the formation of the ion-target complex. This process is much more complicated than the fast ion-molecule collisions. Anion-molecule reaction is partly similar to DEA process, while the most distinct difference should be largely attributed to the different projectile-target interactions.
    Recently, we set up a VMI apparatus to investigate the cation/anion-molecule reaction dynamics, in which a home-made ion beam source is employed. This unique ion source can produce the well-confined pulsed ion bunches.A three-dimensional Newton sphere of the product ions is now recorded with the delay-line-detector (DLD).

    Liquid & Surface

    since 2018

    To study the DEA and electron-induced reactions in liquids or on the vacuum-liquid interfaces, as the first step, we focus on the molecular structure of liquid surface. A new apparatus is successfully set up and time-delayed mass spectrometry is established as a conceptually new method, which enables us to do in situ detection of molecular orientation on the liquid surface. Now this apparatus is being updated, in particular, to enhance its ability to identify the ionic species produced by the electron impact.

    We also are building an apparatus to investigate the hydrated electrons on the liquid surface and the solvated electrons in liquid bulk.In this apparatus,the photodetachment electron sprectrum will be recorded with a home-made magnetic bottle time-of-flight analyser.

    Molecular Control

    since 2016

    to be updated.

    Publication (since 2010)

    Li, H.; Gao, X.-F.; Meng, X.; Tian, S. X.* Dissociative electron attachment to vibrationally excited CO2. Physical Review A 2019, 99, 032703.

    Gao, X.-F.; Li, H.; Meng, X.; Tian, S. X.* Ion-pair dissociations of BrCN by electron impacts. Chinese Journal of Chemical Physics 2019, 32, 89-92. (Dedicated to Professor Kopin Liu on the occasion of his 70th birthday)

    Hu, J.; Wu, C.-X.; Ma, Y.-S.; Tian, S. X.* Collision-energy dependence of the ion-molecule charge exchange reaction Ar+ + NO. Journal of Physical Chemistry A 2018, 122, 9171-9176 (cover story).

    Chen, L.; Chen, Z.; Li, Z.; Hu, J.; Tian, S. X.* Time-delayed mass spectrometry of the low-energy electron impact with a liquid beam surface. Review of Scientific Instruments 2018, 89, 103102.

    Hu, J.; Wu, C.-X.; Tian, S. X.* Note: A well-confined pulsed low-energy ion beam: Test experiments of Ar+. Review of Scientific Instruments 2018, 89, 066104.

    Wang, Y.-F.*; Tian, S. X. Low-energy electron attachment to serine conformers: Shape resonances and dissociation dynamics. Chinese Journal of Chemical Physics 2017, 30, 173-185.

    Ye, Y-.F.; Fu, C-.F.; Tian, S. X.* A molecular dynamics simulation study of ClF in water: Halogen bonding interaction in liquid. Chinese Journal of Chemical Physics 2017, 30, 25-28.

    Li, M.-Y.; Gao, X.-F.; Wang, X.-D.; Li, H.; Tian, S. X.* S- velocity images of dissociative electron attachment to OCS. International Journal of Mass Spectrometry 2016, 404, 20-23 (cover story).

    Feng, W.-L.; Tian, S. X.* Ab initio molecular dynamics simulation study of dissociative electron attachment to C6H5(CH2)nCl (n = 0, 1, 2, 3, 4). International Journal of Mass Spectrometry 2016, 399-400, 40-43.

    Wang, X.-D.; Gao, X.-F.; Xuan, C.-J., Tian, S. X.* Dissociative electron attachment to CO2 produces molecular oxygen. Nature Chemistry 2016, 8, 258-263.

    Tian, S. X.*; Luo, Y. Reply to "Comment on 'Coherent interference in the resonant dissociative electron attachment to carbon monoxide'". Physical Review A 2015, 91, 056702.

    Wang, X.-D.; Xuan, C.-J.; Luo, Y.; Tian, S. X.* Coherent resonances observed in the dissociative electron attachment to carbon monoxide. Journal of Chemical Physics 2015, 143, 066101.

    Feng, W.-L.; Tian, S. X.* Ab initio molecular dynamics simulation study of dissociative electron attachment to dialanine conformers. Journal of Physical Chemistry A 2015, 119, 1838-1845.

    Wang, X.-D.; Xuan, C.-J.; Feng, W.-L.; Tian, S. X.* Dissociative electron attachments to ethanol and acetaldehyde: A combined experimental and simulation study. Journal of Chemical Physics 2015, 142, 064316.

    Xuan, C.-J.; Wang, X.-D.; Xia, L.; Wu, B.; Li, H.; Tian, S. X.* Dissociative electron attachment to 1,2-dichlorobenzene by using mass spectrometry with phosphor screen. Chinese Journal of Chemical Physics 2014, 27, 628-630.

    Fu, C.-F.; Tian, S. X.* Different aggregation dynamics of the benzene-water mixtures. Physical Chemistry and Chemical Physics 2014, 16, 21957-21963 (backcover story).

    Xia, L.; Wang, X.-D.; Xuan, C.-J.; Zeng, X.-J.; Li, H.-K.; Tian, S. X.*; Pan, Y.; Lau, K.-C.* State mixing by spin-orbit coupling of the anionic chloroiodine dissociations. Journal of Chemical Physics (Communication) 2014, 140, 041106.

    Yan, S.; Zhang, P.; Ma, X.*; Xu, S.; Tian, S. X.; Li, B.; Zhu, X. L.; Feng, W. T.; Zhao, D. M. Dissociation of the Ar trimer induced by a third atom in high-energy electron-impact ionization. Physical Review A 2014, 89, 062707.

    Tian, S. X.*; Wu, B.; Xia, L.; Li, H.-K.; Zeng, X.-J.; Luo, Y.; Yang, J. L. Coherent interference in the resonant dissociative electron attachment to carbon monoxide. Physical Review A 2013, 88, 012708.

    Fu, C.-F.; Tian, S. X.* Thermodynamics of ammonia and ammonium ion at the aqueous solution-air interfaces. Journal of Physical Chemistry C 2013, 117, 13011-13020.

    Li, H.-K.; Xia, L.; Zeng, X.-J.; Tian, S. X.* Two- and three-body dissociation dynamics of temporary negative ion NF3-. Journal of Physical Chemistry A 2013, 117, 3176-3182.

    Chu, G.B.; Chen, J; Liu, F.Y.*; Shan, X.B.; Sheng, L.S.; Xu, Y.F.; Tian, S. X. Positive and negative photoion spectroscopy study of C2Cl4. Molecular Physics 2013, 111, 427-435.

    Zeng, X.-J.; Xia, L.; Li, H.-K.; Lau, K.-C.; Tian, S. X.* Anion velocity imaging study of the dissociative electron attachment to CFCl3. Physical Review A 2013, 87, 012711. Selected into 'Kaleidoscope' of PRA Journal web site (January, 2013).

    Xia, L.; Zeng, X.-J.; Li, H.-K.; Wu, B.; Tian, S. X.* Orientation effect in the low-energy electron attachment to the apolar carbon tetrafluoride molecule. Angewandte Chemie, International Edition (Communication) 2013, 52, 1013-1016.

    Xia, L.; Wu, B.; Li, H.-K.; Zeng, X.-J.; Tian, S. X.* Imaging the indirect dissociation dynamics of temporary negative ion: N2O- -> N2 + O-. Journal of Chemical Physics (Communication) 2012, 137, 151102 (4 pages). One of the journal's Top 20 most read articles, in Oct. 2012.

    Wu, B.; Xia, L.; Wang, Y.-F.; Li, H.-K.; Zeng, X.-J.; Tian, S. X.* Renner-Teller effect on dissociative electron attachments to carbon dioxide. Physical Review A 2012, 85, 052709.

    Tian, S. X. Photoion-pair dissociation dynamics of polyatomic molecules with synchrotron radiation. Physical Chemistry Chemical Physics 2012, 14, 6433-6443 (Perspective Article).

    Wang, Y.-F.; Tian, S. X.* Low-energy electron collisions with formamide using the R-matrix method. Physical Review A 2012, 85, 012706.

    Wu, B.; Xia, L.; Li, H.-K.; Zeng, X.-J.; Tian, S. X.* Positive / negative ion velocity mapping apparatus for electron-molecule reactions. Review of Scientific Instruments 2012, 83, 013108.

    Xu, Y.-F.; Tian, S. X.*; Chen, L.-L.; Liu, F.-Y.; Sheng, L. S. Positive and negative photoion mass spectroscopy study of monochlorothiophenes. Journal of Physical Chemistry A 2011, 115, 11920-11929.

    Wang, Y.-F.; Tian, S. X.* Low-energy electron impact with thioformaldehyde. Physical Review A 2011, 84, 022709.

    Wang, Y.-F.; Tian, S. X.*; Yang, J. L. Resonant dissociative electron attachments to cysteine and cystine. Physical Chemistry Chemical Physics 2011, 13, 15597-15602.

    Fu, C.-F.; Tian, S. X.* A comparative study for molecular dynamics simulations of liquid benzene. Journal of Chemical Theory and Computation 2011, 7, 2240-2252. One of the journal's Top 20 most downloaded articles, July, 2011.

    Chen, L.-L.; Tian, S. X.*; Xu, Y.-F.; Chu, G.-B.; Liu, F.-Y.; Shan, X.-B.; Sheng, L. S. Vacuum ultraviolet negative photoion spectroscopy of dichlorodifluoromethane. International Journal of Mass Spectrometry 2011, 305, 20-25.

    Chen, L.-L.; Tian, S. X.*; Xu, Y.-F.; Chu, G.-B.; Liu, F.-Y.; Shan, X.-B.; Sheng, L. S. Ion-pair photodissociation study of trichloromonofluoromethane. Chinese Journal of Chemical Physics 2011, 24, 261-266.

    Chen, L.-L.; Xu, Y.-F.; Feng, Q.; Tian, S. X.*; Liu, F.-Y.; Shan, X.-B.; Sheng, L. S. Vacuum ultraviolet negative photoion spectroscopy of chloroform. Journal of Physical Chemistry A 2011, 115, 4248-4254.

    Wang, Y.-F.; Tian, S. X.* Shape-resonance states of the low-energy electron attachments to DNA base tautomers. Physical Chemistry Chemical Physics 2011, 13, 6169-6175.

    Tian, S. X.*; Xu, Y.-F.; Wang, Y.-F.; Feng, Q.; Chen, L.-L.; Sun, J. D.; Liu, F. Y.; Shan, X.-B.; Sheng, L. S. Ion-pair photodissociations of benzyl chloride through inner-valence electron excitations. Chemical Physics Letters 2010, 496, 254-256.

    Li, H.-B.; Tian, S. X.*; Yang, J. L. Propene oxidation on V4O11- cluster: Reaction dynamics to acrolein. Journal of Physical Chemistry A 2010, 114, 6542-6549.

    Mahmoodi-Darian, M.; Tian, S. X.; Denifl, S.*; Matejcik, S.; Maerk,T. D.; Scheier, P. Temperature dependence of electron attachment to 1-bromo-2-chlorobenzene and 1-bromo-3-chlorobenzene. International Journal of Mass Spectrometry 2010, 293, 51-55.

    Fu, C.-F.; Tian, S. X.* Molecular dynamics study of solvation differences between cis- and transplatin molecules in water. Journal of Chemical Physics 2010, 132, 174507 (7 pages). also selected by Virtual Journal of Biological Physics Research (May 15 issue, 2010) at http://www.vjbio.org

    Ko, Y. J.; Wang, H.; Cao, R.; Radisic, D.; Eustis, S. N.; Tian, S. X.*; Bowen, K. H.* Photoelectron spectroscopy of homogeneous nucleic acid base dimer anions. Physical Chemistry Chemical Physics 2010, 12, 3535-3541.

    * represents the corresponding author(s).

    Contact

    Recruitment: Our group has limited openings for graduate students /postdoctoral associates. Skills in atom, molecule, ion, or electron impact experiments / theories are particularly valuable.
    Office Phone: (+86) 551 63606465
    Lab Phone: (+86) 551 63606744
    Email: sxtian@ustc.edu.cn

    Address

    Department of Chemical Physics, USTC
    96 Jinzhai Road, Hefei City, Anhui 230026
    China