Zwier, Timothy - Purdue University - Department of Chemistry

个人简介

B.S. 1977, Calvin College; Ph.D. 1981, University of Colorado at Boulder.

研究领域

Research in the Zwier group utilizes lasers as probes of the structure, dynamics, and photochemistry of isolated molecules and molecular clusters. Pulsed, tunable radiation spanning the infrared, visible, ultraviolet, and vacuum ultraviolet regions of the spectrum is used for this purpose. In much of our work, a supersonic expansion is used to cool the molecules in the gas phase and to form molecular clusters containing from two to tens of molecules. Molecular spectroscopy of these species employs various laser-based methods including laser-induced fluorescence, resonant multiphoton ionization time-of-flight mass spectroscopy, cavity ring-down spectroscopy, and a number of double resonance schemes. One of our current research projects involves the study of the spectroscopy and dynamics of flexible biomolecules. The spectroscopic signatures of single conformations of these molecules are determined, and then used to selectively excite single conformations in order to study their conformational isomerization dynamics. Another area of active investigation is the photochemistry of small hydrocarbons and nitriles of relevance to planetary atmospheres, where we seek to determine the source of the visible absorbing haze present in the atmosphere of Titan, one of the moons of Saturn. Finally, we are studying the spectroscopy and dynamics of chemical isomerization processes that lead to aromatic ring formation in combustion, a key precursor to soot formation.

近期论文

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Edwin L. Sibert III, Nathanael M. Kidwell, and Timothy S. Zwier, "A First-Principles Model of Fermi Resonance in the Alkyl CH Stretch Region: Application to Hydronaphthalenes, Indanes, and Cyclohexane", J. Phys. Chem. B, James L. Skinner Festschrift, (2014). Joseph R. Gord, Patrick S. Walsh, Brian F. Fisher, Samuel H. Gellman, and Timothy S. Zwier, "Mimicking the First Turn of an α-Helix with an Unnatural Backbone: Conformation-Specific IR and UV Spectroscopy of Cyclically Constrained β/γ-Peptides", J. Phys. Chem. B. James L. Skinner Festschrift, (2014). Vanesa Vaquero-Vara, Di Zhang, Brian C. Dian, David W. Pratt, and Timothy S. Zwier, "Delicate Balance of Hydrogen Bonding Forces in D-Threoninol", J. Phys. Chem. A, Kenneth D. Jordan Festschrift, (2014). Patrick S. Walsh, Ryoji Kusaka, Evan G. Buchanan, William H James III, Brian F. Fisher, Samuel H. Gellman, and Timothy S. Zwier, "Cyclic Constraints on Conformational Flexibility in γ-Peptides: Conformation Specific IR and UV Spectroscopy", J. Phys. Chem. A. 117, 12350-12362 (2013). Ryoji Kusaka, Di Zhang, Patrick S. Walsh, Joseph R. Gord, Brian F. Fisher, Samuel H. Gellman, and Timothy S. Zwier, "Role of Ring-Constrained γ-Amino Acid Residues in α/γ-Peptide Folding: Single-Conformation IR and UV Spectroscopy", J. Phys. Chem. A, 117(42), 10847-10862, (2013). James G. Redwine, Zachary S. Davis, Nicole L. Burke, Robert A. Oglesbee, Scott A. McLuckey, and Timothy S. Zwier, "A novel ion trap based tandem mass spectrometer for the spectroscopic study of cold gas phase polyatomic ions", International Journal of Mass Spectrometry, 348, 9-14, (2013). Evan G. Buchanan, Joseph R. Gord, and Timothy S. Zwier, "Solvent Effects on Vibronic Coupling in a Flexible Bichromophore: Electronic Localization and Energy Transfer induced by a Single Water Molecule", J. Phys. Chem. Lett., 4(10), 1644-1648, (2013). Evan G. Buchanan, Edwin L. Sibert III, and Timothy S. Zwier, "Ground State Conformational Preferences and CH Stretch-Bend Coupling in a Model Alkoxy Chain: 1,2-Diphenoxyethane", J. Phys. Chem. A, 117(13), 2800-2811, (2013). Nathanael M. Kidwell, Neil J. Reily, Ben Nebgen, Deepali N. Mehta-Hurt, Ross D. Hoen, Damian L. Kokkin, Michael C. McCarthy, Ludymila V. Slipchenko, and Timothy S. Zwier, "Jet-Cooled Spectroscopy of the α-Methylbenzyl Radical: Probing the State-Dependent Effects of Methyl Rocking Against a Radical Site", J. Phys. Chem. A, 117(50), 13465-13480 (2013) Jacob C. Dean, Polina Navotnaya, Alexander P. Parobek, Rachel M. Clayton, and Timothy S. Zwier, "Ultraviolet spectroscopy of fundamental lignin subunits: Guaiacol, 4-methylguaiacol, syringol, and 4-methylsyringol", J. Chem. Phys., 139(14), 144313 (2013). Evan G. Buchanan, Patrick S. Walsh, David F. Plusquellic, and Timothy S. Zwier, "Excitonic splitting and vibronic coupling in 1,2-diphenoxyethane:Conformation-specific effects in the weak coupling limit", J. Chem. Phys., 138(20), 204313, (2013). Evan G. Buchanan, Jacob C. Dean, Timothy S. Zwier, and Edwin L. Sibert III, "Towards a first-principles model of Fermi resonance in the alkyl CH stretch Region: Application to 1,2-diphenylethane (DPE) and 2,2,2-paracyclophane (TCP)", J. Chem. Phys., 138(6), 064308, (2013). Timothy S. Zwier, "Interrogating Interfaces and Core Electrons via Nonlinear Laser Methods", J. Phys. Chem. Lett., 4(2), 303, (2013). Timothy S. Zwier, "Optical Interrogation of Complex Interfaces", J. Phys. Chem. Lett., 3(20), 3070, (2012). Jacob C. Dean, Evan G. Buchanan, and Timothy S. Zwier, "Mixed 14/16 Helices in the Gas Phase: Conformation-Specific Spectroscopy of Z-(Gly)(n), n = 1, 3, 5", J. Am. Chem. Soc., 134(41), 17186-17201, (2012). Evan G. Buchanan, William H. James III, Soo Hyuk choi, Li Guo, Samuel H. Gellman, Christian W. Müller, and Timothy S. Zwier, "Single-conformation infrared spectra of model peptides in the amide I and amide II regions: Experiment-based determination of local mode frequencies and inter-mode coupling", J. Chem. Phys. 137(9), 094301, (2012). Timothy S. Zwier, "Photoinduced Dynamics in Membranes and at Interfaces", J. Phys. Chem. Lett., 3(12), 1721, (2012). Timothy S. Zwier, “Probing Frozen Molecular Embraces”, Science 335, 668-9 (2012). (Invited perspective). Joshua A. Sebree, Nathanael M. Kidwell, Talitha M. Selby, Brent K. Amberger, Robert J. McMahon, and Timothy S. Zwier, “Photochemistry of Benzylallene: Ring-closing Reactions to form Naphthalene”, J. Am. Chem. Soc. 134, 1153-63 (2012). Joshua A. Sebree and Timothy S. Zwier, “The Excited States and Vibronic Spectroscopy of Diphenyldiacetylene and Diphenylvinylacetylene”, Phys. Chem. Chem. Phys. 14, 173-183 (2012).