Scientific Research Division
Shih-Huang Lee (李世煌), Ph. D.
Research Scientist
Molecular Science Group
Office: Room S317, R&D Building
E-Mail: shlee@nsrrc.org.tw,
Tel: +886-35780281-7317
Education
1987–1991: B. S. in Department of Chemistry, National Tsing Hua University, Taiwan.
1991–1992: M. S. in Department of Chemistry, National Tsing Hua University, Taiwan.
1992–1996: Ph.D in Department of Chemistry, National Tsing Hua University, Taiwan.
Employment
1996–2001: Postdoctoral Fellow at IAMS, Academia Sinica, Taiwan.
2001–2004: Assistant Research Scientist, NSRRC, Taiwan.
2003–2004: Part-Time Assistant Professor, Department of Chemistry, National Tsing Hua University, Taiwan.
2005–2009: Associate Research Scientist, NSRRC, Taiwan.
2005–2006: Part-Time Associate Professor, Department of Chemistry, National Tsing Hua University, Taiwan.
2007–2008: Molecular-Science Group Leader, NSRRC, Taiwan.
2008–2009: Adjunct Associate Professor, Department of Applied Chemistry, National Chiao Tung University, Taiwan.
2010–present: Research Scientist, NSRRC, Taiwan.
2011–2012: Molecular-Science Group Leader, NSRRC, Taiwan.
2010–2013: Adjunct Professor, Department of Applied Chemistry, National Chiao Tung University, Taiwan.
2012–2014: Deputy Division Head of the Scientific Research Division, NSRRC, Taiwan.
2015–present: Molecular-Science Group Leader, NSRRC, Taiwan
Award
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The Distinguished Lectureship Award in the CSJ (Chemical Society of Japan) Asian International Symposium (2014)
Research Interest
Because carbon is the fourth most abundant element in our solar system and in the universe, hydrocarbon chemistry plays an important role in planetary atmospheres, interstellar/circumstellar environments, fuel combustions, etc. Therefore, the study of dynamics of carbon reactions can facilitate the understanding of stellar evolution. The crossed molecular-beam apparatus (Figure 1) combined with synchrotron vacuum-ultraviolet (VUV) ionization has been demonstrated to be a powerful tool in the investigation of dynamics of elementary chemical reactions. We have explored the dynamics of C/H and C/X exchanges in the reactions of 3P carbon atoms with ethene (C2H4), propene (C3H6), vinyl fluoride (C2H3F), and vinyl chloride (C2H3Cl) using the crossed molecular-beam apparatus. Figure 2 presents the three-dimensional product velocity contours for the reactions of C + C2H3X C3H2X + H / C3H3 + X; X = H, F, Cl, and CH3. The success encourages us to extend our research to reactions of free radicals (e.g., CH, C2H, C3H, C4H, C5H, and C6H) with unsaturated hydrocarbons (e.g., C2H2, C3H4, C2H4, C3H6, C4H2, and C6H2). Free radicals are producible from proper precursors by various cracking approaches such as discharge, pyrolysis, and photolysis. Here, we choose the discharge approach to produce a variety of hydrocarbon radicals from a mixture of 1% – 5% ethyne seeded in a noble gas. This project is aimed to unravel the formation mechanisms and dynamics of polyynes (CnH2) and their derivatives via measurements of translational-energy distributions, angular distributions, branching ratios, and photoionization spectra of products. Furthermore, the reaction potential-energy surface will be established with density-functional theory (DFT) and ab-initio methods as well as rate coefficients and product branching ratios will be calculated by Rice-Ramsperger-Kassel-Marcus (RRKM) theory. The combination of crossed-beam experiments and quantum-chemical calculations will give a whole picture for the reactions of CnH (n = 1 – 6) radicals with unsaturated hydrocarbons.
Figure 1. Photograph of the crossed molecular-beam apparatus.
Figure 2. Three-dimensional velocity contours of C3H2X and C3H3 produced from the reactions of C + C2H3X C3H2X + H / C3H3 + X; X = H, F, Cl and CH3.
Selected Publication
1. S.-H. Lee,* C.-H. Chin, and C. Chaudhuri , “Evidence of Synchronous Concerted Three-Body Dissociation of Propenal to C2H2 + CO + H2 ”, ChemPhysChem 12, 753 (2011).
2. C. Chaudhuri and S.-H. Lee,* “A complete look at the multi-channel dissociation of propenal photoexcited at 193 nm: branching ratios and distributions of kinetic energy”, Phys. Chem. Chem. Phys. 13, 7312 (2011).
3. S.-H. Lee,* C.-H. Chin, W.-K. Chen, W.-J. Huang, and C.-C. Hsieh,“Exploring the dynamics of reaction N(2D) + C2H4 with crossed molecular-beam experiments and quantum-chemical calculations”, Phys. Chem. Chem. Phys. 13, 8515 (2011), invited paper.
4. C.-H. Chin and S.-H. Lee,* “Comparison of two-body and three-body decomposition of ethanedial, propanal, propenal, n-butane, 1-butene and 1,3-butadiene”, J. Chem. Phys. 136, 024308 (2012).
5. S.-H. Lee,* W.-J. Huang, Y.-C. Lin, and C.-H. Chin,“Searching for interstellar molecule butatrienylidene in reaction C2 + C2H4”, Astrophys. J. 759, 75 (2012).
6. S.-H. Lee,* W.-K. Chen, C.-H. Chin, and W.-J. Huang, “Dynamics of the C/H and C/F exchanges in the reaction of 3P carbon atoms with vinyl fluoride”, J. Chem. Phys. 139, 064311 (2013).
7. S.-H. Lee,* W.-K. Chen, C.-H. Chin, and W.-J. Huang, “Exploring the dynamics of C/H and C/Cl exchanges in the C(3P) + C2H3Cl reaction”, J. Chem. Phys. 139, 134301 (2013).
8. S.-H. Lee,* W.-K. Chen, C.-H. Chin, and W.-J. Huang, “Dynamics of carbon-hydrogen and carbon-methyl exchanges in the collision of 3P atomic carbon with propene”, J. Chem. Phys. 139, 174317 (2013).
9. W.-J. Huang, Y.-L. Sun, C.-H. Chin, and S.-H. Lee,* “Dynamics of the reaction of C3(a 3Piu) radicals with C2H2: A new source for the formation of C5H”, J. Chem. Phys. 141, 124314 (2014).
10. Y.-L. Sun, W.-J. Huang, C.-H. Chin, and S.-H. Lee,* “Dynamics of the reaction of C2 with C6H2: An implication for the formation of interstellar C8H”, J. Chem. Phys. 141, 194305 (2014).