个人简介

B.Sc.(Waterloo); Ph.D. (British Columbia); Associate(Harvard University)

研究领域

Physical chemistry, Analytical chemistry

High Resolution Laser Spectroscopy of diatomic transition metal compounds and small molecules, Ab initio calculation of metal containing radicals. Study of catalytic reaction of methane and carbon dioxide, and direct conversion of methane to higher hydrocarbons such as benzene and naphthalene using supersonic jet expansion approach. Catalytic formation of polycyclic aromatic hydrocarbons (PAHs) on nanosized silicates. This research is to study the catalytic formation of PAHs from acetylene over astrophysically relevant olivine and pyroxene type silicates. Reaction products are detected using the time-of-flight mass-spectrometry (TOF-MS) technique. Research programmes: 1. High Resolution Laser Spectroscopy of Metal Containing Compounds in the Gas-phase My research interest is focused on the area of high-resolution spectroscopic studies of transition metal compounds. With our home built laser vaporization/reaction free jet expansion molecular source, we have successfully studied a series of new molecules, such as transition metal halides, carbides, phosphides and sulfides. Using the very sensitive laser induced fluorescence (LIF), optical- optical double resonance (OODR), and cavity ring down (CRDS) spectroscopy; we have characterized the electronic studies of many new molecules, which include molecular structure, molecular orbital occupancy, and rotational and vibrational constants. We are also interested in studying the hyperfine structure of these metal- containing compounds. The molecules of interest presently are transition metal sulfides- VS, LaS; halides - ScBr, ScI; nitrides - TiN, ZrN; oxide - IrO, RuO; borides - IrB, PtB, PdB, RuB, CoB and phosphides - ScP, YP etc. 2. Catalytic reaction of CH4 This research is to study the reaction intermediates in the CO2 reforming reaction of CH4 in a supersonic nozzle beam using Ni, Mo and Zn - based catalysts. The sensitive cw-cavity ring down spectroscopy is used as a diagnostic tool to monitor the formation of intermediates. We also study the dehydroaromatization reaction of CH4 for the production of hydrogen and aromatic products under supersonic jet condition. The products are detected using the time-of-flight mass-spectrometry (TOF-MS) technique. 3. Catalytic formation of polycyclic aromatic hydrocarbons (PAHs) on nanosized silicates The formation mechanism of PAHs in interstellar and circumstellar environments is not well understood although the presence of these molecules is widely accepted. This research is to study the catalytic formation of PAHs from acetylene over astrophysically relevant olivine and pyroxene type silicates. Reaction products are detected using the time-of-flight mass-spectrometry (TOF-MS) technique.

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S. H. Yeung, M. C. Chan, N. Wang, A. S. C. Cheung, Observation of the Delta v = -4 vibronic sequence of the C-2 Swan system. Chemical Physics Letters 557, 31 (Feb, 2013). M. Tian et al., Catalytic conversion of acetylene to polycyclic aromatic hydrocarbons over particles of pyroxene and alumina. Philosophical Transactions of the Royal Society a-Mathematical Physical and Engineering Sciences 371, (Jul, 2013). T. M. Ma, L. Li, J. W. H. Leung, A. S. C. Cheung, Cavity ring-down laser absorption spectroscopy of YBr and YI. Molecular Physics 111, 111 (Jan, 2013). Z. W. Liao, Y. Xia, M. C. Chan, A. S. C. Cheung, Near infrared laser spectroscopy of Scl: The C-1 Sigma(+)-X-1 Sigma(+) transition. Chemical Physics Letters 570, 33 (May, 2013). C. K. Lai et al., Laser-induced dissociation of singly protonated peptides at 193 and 266nm within a hybrid linear ion trap mass spectrometer. Rapid Communications in Mass Spectrometry 27, 1119 (May, 2013). M. J. Jamieson, A. S. C. Cheung, Predissociation linewidths in the spectrum of gallium nitride. European Physical Journal D 67, (Jan, 2013). Y. Xia, Z. W. Liao, M. Yang, M. C. Chan, A. S. C. Cheung, Laser spectroscopy of the C-1 Sigma(+)-X-1 Sigma(+) transition of ScBr. Chemical Physics Letters 527, 7 (Feb, 2012). Y. Xia, Z. W. Liao, M. C. Chan, A. S. C. Cheung, Near infrared laser spectroscopy of ScBr: The e(3)Delta - a(3)Delta and d(3)Phi - a(3)Delta systems. Chemical Physics 408, 50 (Oct, 2012). N. Wang, Y. W. Ng, A. S. C. Cheung, Laser induced fluorescence spectroscopy of ruthenium monoboride. Chemical Physics Letters 547, 21 (Sep, 2012). M. Tian et al., Formation of polycyclic aromatic hydrocarbons from acetylene over nanosized olivine-type silicates. Physical Chemistry Chemical Physics 14, 6603 (2012). H. F. Pang, Y. W. Ng, A. S. C. Cheung, Electronic Transitions of Iridium Monoxide: Ground and Low-Lying Electronic States. Journal of physical chemistry A 116, 9739 (Oct, 2012). Y. W. Ng, Y. S. Wong, H. F. Pang, A. S. C. Cheung, Electronic transitions of platinum monoboride. Journal of Chemical Physics 137, (Sep, 2012). Y. W. Ng, H. F. Pang, Y. Qian, A. S. C. Cheung, Electronic Transition of Palladium Monoboride. Journal of physical chemistry A 116, 11568 (Nov, 2012). T. M. Ma, G. S. M. Tong, A. S. C. Cheung, Density functional theory study of yttrium monohalides. Molecular Physics 110, 1407 (2012). Z. W. Liao, Y. Xia, M. C. Chan, A. S. C. Cheung, LIF spectroscopy of ScP. Chemical Physics Letters 551, 60 (Nov, 2012). Z. H. Xia, Y. Xia, M. C. Chan, A. S. C. Cheung, Laser spectroscopy of ScI: Rotational analysis of the D-1 Pi-X-1 Sigma(+) system. Journal of Molecular Spectroscopy 268, 3 (Jul-Aug, 2011). H. F. Pang, Y. W. Ng, Y. Xia, A. S. C. Cheung, Electronic transitions of iridium monoboride. Chemical Physics Letters 501, 257 (Jan, 2011). Y. W. Ng, H. F. Pang, A. S. C. Cheung, Laser induced fluorescence spectroscopy of boron carbide. Chemical Physics Letters 509, 16 (Jun, 2011). Y. W. Ng, H. F. Pang, A. S. C. Cheung, Electronic transitions of cobalt monoboride. Journal of Chemical Physics 135, (Nov, 2011). B. S. Liu et al., Characteristic and Mechanism of Methane Dehydroaromatization over Zn-Based/HZSM-5 Catalysts under Conditions of Atmospheric Pressure and Supersonic Jet Expansion. Journal of Physical Chemistry C 115, 16954 (Sep, 2011).