个人简介

1999 B.S. East China Normal University 1999-2001 State Key Laboratory for Optical and Magnetic Resonance Spectroscopy (now State Key Laboratory of Precision Spectroscopy) Shanghai, Research Assistant 2007 Ph.D. The Ohio State University 2007-2010 Swiss Federal Institute of Technology (ETH) Zurich, Postdoctoral Researcher 2010-2011 The Ohio State University, Postdoctoral Researcher

研究领域

Physical Chemistry

Research in the Liu Group consists of spectroscopic studies on gas-phase molecules and molecular complexes, and condensed-phase materials in both frequency domain (using high-resolution lasers) and time domain (using ultrafast laser systems). Our high-resolution studies center around the spectroscopic detection and characterization of reactive chemical intermediates, e.g., free radicals, molecular ions, and molecules in excited electronic states. [Selected publication 1,2,4.] These studies lead to a detailed understanding of molecular structures and dynamics, and the nature of chemical bonding. Unambiguous identification and analysis of the experimentally obtained spectra is a prerequisite to our subsequent work on the chemical reactions that involve these intermediates. We are particularly interested in molecular species with so-called Jahn-Teller effect. This effect causes spontaneous distortion of the symmetry of polyatomic molecules and crystal structure and is associated with many interesting phenomena such as superconductivity. [Selected publication 1.] Quantum chemistry calculations are used to help understanding these molecules and molecular systems. The goal of the ultrafast spectroscopy study in the Liu Group, which is carried out in the Ultrafast Laser Facility in the Conn Center for Renewable Energy Research, is to contribute to the advancement of renewable energy science and technology through basic spectroscopic studies. Currently, our research efforts are focused on the characterization of solar cell materials and understanding the fundamental dynamical processes in the materials and their interfaces, which are essential to their functions and applications. Research opportunities for undergraduates, graduate students (as Research Assistants), and post-docs are available.

近期论文

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"Molecule-Like CdSe Nanoclusters Passivated with Strongly Interacting Ligands: Energy Level Alignment and Photoinduced Ultrafast Charge Transfer Processes", Y. Xie, M. Teunis, B. Pandit, R. Sardar,and J. Liu, J. Phys. Chem. C. 119, 2813−2821 (2015). [Link] DOI: http://dx.doi.org/10.1021/jp510276c). "A DGFETD Port formulation for photoconductive antenna analysis", J. C. Young, D. Boyd, S. D. Gedney, T. Suzuki, and J. Liu, IEEE Antenn. Wirl. Pr. 14, 386-389 (2015). [Link] DOI: 10.1109/LAWP.2014.2364524) "Jet-cooled laser-induced fluorescence spectroscopy of cyclohexoxy: Rotational and fine structure of molecules in nearly degenerate electronic states", J. Liu and T. A. Miller, J. Phys. Chem. A 118, 11871−11890 (2014). [Link] DOI: 10.1021/jp504326p. "Jet-Cooled laser-induced fluorescence spectroscopy of isopropoxy radical: Vibronic analysis of B ̃-X ̃ and B ̃-A ̃ band systems" R. Chhantyal-Pun, M. Roudjane, D. Melnik, T. A. Miller, and J. Liu, J. Phys. Chem. A 118, 11852−11870 (2014). [Link] DOI: 10.1021/jp504322j. “High-resolution spectroscopy and quantum-defect model for the gerade triplet np and nf Rydberg states of He2”, D. Sprecher, J. Liu, T. Krahenmann, M. Schafer, and F. Merkt, J. Chem. Phys. 140, 064304 (16 pages) (2014). [Link] “Charge transfer in rare earth oxide hybrid solar cells”, K. Fernando, B. Pandit, J. Liu, and B. W. Alphenaar, Chem. Phys. Lett. 592, 155-159 (2014). [Link] “Spectroscopic investigation of photoinduced charge transfer Processes in FTO/TiO2/N719 photoanodes with and without covalent attachment through silane-based linkers”, B. Pandit, T. Luitel, D. Cummins, A. K. Thapa, T. Druffel, F. Zamborini, and J. Liu, J. Phys. Chem. A. 117, 13513-13523 (2013). [Link] “Rotationally resolved B ̃ ←X ̃ electronic spectra of the isopropoxy radical: A comparative study”, J. Liu, D. Melnik, and T. A. Miller, J. Chem. Phys. 139, 094308 (27 pages) (2013). [Link] "The spectroscopic characterization of the methoxy radical. III. Rotationally resolved A˜2A1–X˜2E electronic and X ̃2 E submillimeter wave spectra of partially deuterated CH2DO and CHD2O radical", D. G. Melnik, J. Liu, M.-W. Chen, T. A. Miller, and R. F. Curl, J. Chem. Phys. 135, 094310 (26 pages) (2011). [Link] "The ionization and dissociation energies of HD", D. Sprecher, J. Liu, Ch. Jungen, W. Ubachs, and F. Merkt, J. Chem. Phys. 133, 111102 (4 pages) (2010). ("Editors' Choice for 2010" by the Journal of Chemical Physics.) [Link] "Vibrational spectra of chloroform, Freon-11 and selected isotopomers in the terahertz region", Ch. Haase, J. Liu, and F. Merkt, J. Mol. Spectrosc. 262, 61-63 (2010). [Link] "Determination of the ionization and dissociation energies of the deuterium molecule (D2)", J. Liu, D. Sprecher, Ch. Jungen, W. Ubachs, and F. Merkt, J. Chem. Phys.132, 154301 (11 pages) (2010). [Link] "Generation of widely tunable Fourier-transform-limited terahertz pulses using narrowband near-infrared laser radiation", J. Liu, H. Schmutz, and F. Merkt, J. Mol. Spectrosc. 256, 111-118 (2009). [Link] "Determination of the ionization and dissociation energies of the hydrogen molecule", J. Liu, E. J. Salumbides, U. Hollenstein, J. C. J. Koelemeij, K. S. E. Eikema, W. Ubachs, and F. Merkt, J. Chem. Phys. 130, 174306 (8 pages) (2009). [Link] "The spectroscopic characterization of the methoxy radical. II. Rotationally resolved A˜2A1–X˜2E electronic and X ̃2 E microwave spectra of the perdeuteromethoxy radical CD3O",J. Liu, M.-W. Chen, D. Melnik, T. A. Miller, Y. Endo, and E. Hirota, J. Chem. Phys. 130, 074303 (11 pages) (2009). [Link] "The spectroscopic characterization of the methoxy radical. I. Rotationally resolved A˜2A1–X˜2E electronic spectra of CH3O", J. Liu, M.-W. Chen, D. Melnik, J. T. Yi, and T. A. Miller, J. Chem. Phys. 130, 074302 (19 pages) (2009). [Link] "Nuclear-spin effects in the photoionization of krypton", Th. A. Paul, J. Liu, and F. Merkt, Phys. Rev. A 79, 022505 (15 pages) (2009). [Link] "Generation of tunable Fourier-transform-limited terahertz pulses in 4-N,N-dimethylamino-4'-N'-methyl stilbazolium tosylate crystals"，J. Liu and F. Merkt, Appl. Phys. Lett. 93, 131105 (3 pages) (2008). [Link] "Development of the Hamiltonian and matrix elements for partially deuterated methoxy radical", D. Melnik, J. Liu, R. F. Curl, and T. A. Miller, Mol. Phys. 105, 529-540 (2007). [Link] "High resolution spectra and conformational analysis of 2-butoxy radical", V. L. Stakhursky, L. Zu, J. Liu, and T. A. Miller, J. Chem. Phys. 125, 094316 (14 pages) (2006).). [Link]