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| DAVID S. PERRY |
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Professor
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 |
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Office: KNCL 103
(330) 972-6825 |
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Lab: KNCL 302
(330) 972-6835 |
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| Email: dperry@uakron.edu |
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| Website: http://gozips.uakron.edu/~dperry |
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| Research Interests |
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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 infrared laser-assisted photofragment spectroscopy (Swiss Federal Institute, Lausanne), FAAAST sub-millimeter wave spectroscopy (the Ohio State University), 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 focuses 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.
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. |
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Microgravity Combustion
Elimination of gravity results in a tremendous simplification of combustion phenomena by controlling convection and turbulence. In collaboration with Dr. Fletcher Miller of the NASA Glenn Research Center and Professor James Hardy of this department, we have developed the analytical methods needed for microgravity combustion experiments on methanol. The chemometric analysis involves FTIR and diode laser training spectra. Diode lasers are small and rugged enough to be built into compact combustion experiments for the NASA Lewis drop tower facility or for space flights.
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. |
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| Selected Publications |
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Trocia N. Clasp and David S. Perry. Torsion-vibration coupling in methanol: The adiabatic
approximation and IVR scaling. J. Chem. Phys., 125, 104313, 2006
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| Pavel Maksyutenko, Oleg V. Boyarkin, Thomas R. Rizzo and David S. Perry, Conformational dependence of intramolecular vibrational redistribution in methanol, J. Chem. Phys., 126, 044311 2007. |
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| David Rueda, Oleg V. Boyarkin, Thomas R. Rizzo, Indranath Mukhopadhyay and David S. Perry, Torsion-rotation analysis of OH stretch overtone-torsion combination bands in methanol, J. Chem. Phys. 116, 91-100 (2002). |
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| A. Chirokolava, David S. Perry, O.V. Boiarkin, M. Schmid, and T.R. Rizzo, Rotational and torsional analysis of the OH-stretch third overtone in 13CH3OH, J. Mol. Spectrosc. 211, 221-227 (2002). |
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| L. Wang, Y.-B. Duan, R. Wang, G. Duan, I. Mukhopadhyay, D.S. Perry, K. Takagi, Determination of reduced Hamiltonian parameters for the CD3OH isotopomers of methanol, Chem. Phys., 292, 23-29, (2003). |
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| Michael J. Kulis, David S. Perry, Fletcher J. Miller, and Nancy Piltch, A characterization of alcohol fuel vapr for wavelength modulation spectroscopy applied to micrgravity flame spread, NASA Conference Publication (2003), (NASA/CP-2003-212376, Seventh International Workshop on Microgravity Combustion and Chemically Reacting Systems, 2003), 353-356. |
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| Shucheng Xu, Jeffrey J. Kay, and David S. Perry, Doppler-limited CW infrared cavity ringdown spectroscopy of the n1+n3 OH+CH stretch combination band of jet-cooled methanol, J. Mol. Spectrosc. 225, 162-173 (2004). |
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| David Rueda, Oleg V. Boyarkin, Thomas R. Rizzo, Andrei Chirokolava and David S. Perry, Vibrational overtone spectroscopy of jet-cooled methanol from 5,000 to 14,000 cm-1, J. Chem. Phys., 122, 044314 (2005). |
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| Trocia N Clasp and David S Perry, Torsion-vibration coupling in methanol: The adiabatic approximation and IVR scaling, J. Chem. Phys., 125, 104313 (2006). |
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