个人简介

B.S., 1971, University of Toronto Ph.D., 1975, University of Toronto Secondary School Teacher, 1975-1977, Minaki, Tanzania NRCC Postdoctoral fellow, 1977-1979, Stanford University Assistant Professor, 1980-1986, University of Rochester

研究领域

Physical & Analytical Chemistry

Vibrational Spectroscopy High-resolution vibrational spectroscopy is a theme that runs throughout our work. To achieve high spectral resolution, continuous wave infrared lasers are used in combination with a free jet vacuum apparatus that cools the sample molecules to a few degrees Kelvin. Cavity ringdown spectroscopy allows us to achieve very high sensitivity. Through collaborations with other institutions, we also use coherence-detected infrared-microwave double resonance spectroscopy (University of Virginia), infrared laser-assisted photofragment spectroscopy (Swiss Federal Institute, Lausanne), and slit-jet Fourier transform infrared spectroscopy (Pacific Northwest National Lab). These techniques are particularly effective in uncovering the couplings among the various molecular vibrations and with rotational motion. Atmospheric Chemistry Our work in this area has focused on the infrared spectroscopy of halocarbon compounds. Some halocarbons (CFCs) that are implicated in depletion of the stratospheric ozone layer have been banned. The replacement compounds (HFCs and HCFCs) that are now used in refrigeration and air conditioning still absorb in the infrared atmospheric window and, therefore, contribute to global warming. We are also interested in the spectroscopy of fuels used in combustion and of chemicals produced by combustion in the course of producing energy. Intramolecular Dynamics When a molecule is excited with a substantial amount of vibrational energy, the energy does not stay in the prepared vibration but redistributes to other degrees of freedom within the molecule. This phenomenon, termed IVR, is an essential ingredient in understanding the chemical reactivity of excited molecules. When IVR occurs, spectral splittings are observed, such as those illustrated below for nitromethane. We have found that IVR is faster in flexible molecules; therefore, we are studying molecules with large amplitude motions such as internal rotation. Perry Research Photo Theory Theoretical work in our group is undertaken in support of the experimental effort in the above areas. This work includes quantum mechanical models of IVR and ab initio molecular structure calculations.

近期论文

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Communication: Conical Intersections between Vibrationally Adiabatic Surfaces in Methanol, Mahesh B. Dawadi and David S. Perry, J. Chem. Phys., 140, 161101 (2014). (featured article) http://dx.doi.org/10.1063/1.4871657. In situ shallow subsurface reflectance spectroscopy of archaeological soils and features: A case-study of two Native American settlement sites in Kansas, Timothy Matney, L. Barrett, Mahesh B. Dawadi, D. Maki, C. Maxton, David S. Perry, D. C. Roper, L. Somers, L. G. Whitman, Journal of Archaeological Science, 43, 315-324 (2014). http://dx.doi.org/10.1016/j.jas.2013.11.027. Torsionally-induced blue-shift of the band gap in poly(3-hexylthiophene), Ram Bhatta, Mesfin Tsige, and David Perry, J. Compt. Theor. Nanosc. 11, 1-8 (2014). http://dx.doi.org/10.1166/jctn.2014.3621. Nanostructures and Electronic Properties of a High-Efficiency Electron-Donating Polymer, RamBhatta, David Perry and MesfinTsige, J. Phys. Chem. A 117, 12628-12634(2013). http://dx.doi.org/10.1021/jp409069d. Torsion-Inversion Tunneling Patterns in the CH-Stretch Vibrationally Excited States of the G12 Family of Molecules Including Methylamine, Mahesh B Dawadi, Ram S. Bhatta and David S Perry, J. Phys. Chem. A. (2013). http://dx.doi.org/10.1021/jp406668w. Improved force field for molecular modeling of poly(3-hexyl thiophene), Ram S. Bhatta, Yeneneh Y. Yimer, David S. Perry and Mesfin Tsige, J. Phys. Chem. B. 117, 10035-10045 (2013). http://dx.doi.org/10.1021/jp404629a. Molecular spectroscopy and dynamics: A polyad-based perspective, Michel Herman and David S. Perry, Phys. Chem. Chem. Phys. 15, 9970-9993 (2013). http://dx.doi.org/10.1039/C3CP50463H. Novel patterns of torsion-inversion-rotation energy levels in the n11 asymmetric CH-stretch spectrum of methylamine, Mahesh B. Dawadi, C. Michael Lindsay, Andrei Chirokolava, David S. Perry and Li-Hong Xu, J. Chem. Phys. 138, 104305 (2013). http://dx.doi.org/10.1063/1.4794157. A New Approach toward Transition State Spectroscopy, Kirill Prozument, Rachel Glyn Shaver, Monika Ciuba, John S. Muenter, G. Barratt Park, John F. Stanton, Hua Guo, Bryan M. Wong, David S. Perry, and Robert W. Field, Faraday Discuss. 163, 33-57 (2013). http://dx.doi.org/10.1039/C3FD20160K. Correlated backbone torsional potentials in poly(3-methylthiophene), Ram S. Bhatta and David S. Perry, Computational and Theoretical Chemistry 1008, 90-95 (2013) http://dx.doi.org/10.1016/j.comptc.2013.01.003. Hierarchies of Intramolecular Vibration-Rotation Dynamical Processes in Acetylene up to 13,000 cm-1, David S. Perry, Jonathan Martens, Badr Amyay, and Michel Herman, Mol. Phys. 110, 2687-2705 (2012), http://dx.doi.org/10.1080/00268976.2012.711493. Nonplanar Conformations and Torsional Potentials of Poly(3-hexylthiophene) Oligomers: Density Functional Calculations up to the Dodecamer, Ram S. Bhatta, Yeneneh Yimer, Mesfin Tsige, and David S. Perry, Computational and Theoretical Chemistry 995, 36-42 (2012). http://dx.doi.org/10.1016/j.comptc.2012.06.026. IR and FTMW-IR Spectroscopy and Vibrational Relaxation Pathways in the CH Stretch Region of CH3OH and CH3OD, Sylvestre Twagirayezu, Xiaoliang Wang, David S. Perry, Justin L. Neill, Matt T. Muckle, Brooks H. Pate, Li-Hong Xu, J. Phys. Chem. A, 115, 9748-9763 (2011), http://dx.doi.org/10.1021/jp202020u. Coherence-converted population transfer FTMW-IR double resonance spectroscopy of CH3OD in the OD -stretch region, Sylvestre Twagirayezu; David S. Perry, PhD; Justin L Neill; Matt T Muckle, J. Mol. Spectrosc., 262, 65-68 (2010), http://dx.doi.org/10.1016/j.jms.2010.05.003. Vibrational coupling pathways in methanol as revealed by coherence-converted population transfer FTMW-IR double resonance spectroscopy, Sylvestre Twagirayezu, Trocia N. Clasp, David S. Perry, Justin L. Neill, Matt T. Muckle, Brooks H. Pate, J. Phys. Chem. A, 114, 6818-6828 (2010), http://dx.doi.org/10.1021/jp1019735. Vibration–rotation alchemy in acetylene (12C2H2) at low vibrational excitation: From high resolution spectroscopy to fast intramolecular dynamics (invited article), David Perry, Anthony Miller, B. Amyay, A. Fayt and M. Herman, Mol. Phys. 108, 1115-1132 (2010), http://dx.doi.org/10.1080/00268971003660874. A comparative ab initio study of torsion-inversion coupling in CH3NH2, CH3OH2+ and CH3CH2, Ram S Bhatta, Amy Gao, David S Perry, A comparative ab initio study of torsion-inversion coupling in CH3NH2, CH3OH2+ and CH3CH2, J. Mol. Struct.: THEOCHEM, 941, 22-29 (2009), http://dx.doi.org/10.1016/j.theochem.2009.10.033. The Adiabatic Approximation as a Diagnostic Tool for Torsion-Vibration Dynamics (feature article), David S. Perry, J. Mol. Spectrosc. 257, 1-10 (2009),http://dx.doi.org/10.1016/j.jms.2009.05.002. Torsion-vibration coupling in methanol: Diabatic behavior in the CH overtone region, David S. Perry, J. Phys. Chem. A 112, 215-223 (2008),http://dx.doi.org/10.1021/jp077269q Conformational dependence of intramolecular vibrational redistribution in methanol, Pavel Maksyutenko, Oleg V. Boyarkin, Thomas R. Rizzo and David S. Perry, J. Chem. Phys., 126, 044311 (2007) (6 pages). http://link.aip.org/link/?JCPSA6/126/044311/1