个人简介

Alfred P. Sloan Fellowship (Washington), 1999 Research Corp. College Cottrell Fellowship (Washington), 1998 National Science Foundation CAREER Award (Washington), 1997 Camille and Henry Dreyfus New Faculty Award (Washington), 1995

研究领域

Physical Chemistry

Environmental Chemistry. In many chemical reactions of environmental interest, product formation dynamics are dependent on the phase (i.e., gas, solution, or solid) in which the chemistry occurs. We are particularly interested in the photochemistry of halogen-containing compounds, where the efficiency of halogen production is phase dependent. The goal of our research in this area is to develop a detailed understanding of this phase-dependent reactivity. To accomplish this goal, we employ a multidimensional experimental approach in which multiple time- and frequency-domain spectroscopic techniques (resonance Raman intensity analysis, time-resolved resonance Raman, time-resolved infrared and femtosecond pump-probe) are employed. The synergistic application of these spectroscopies allows for the study of chemical reactivity from the initial excited-state evolution to the appearance and relaxation of the ground-state products. Materials Chemistry. In collaboration with other research groups in the Center for Materials and Devices for Information Technology Research (CMDITR), we are developing novel optical materials for telecommunications and information processing. The recent development of promising organic photonic materials and special device architectures such as photonic bandgap lattices suggests that organic materials will play an important role in next generation of electro-optical (EO) switches. Our research in this area involves the characterization of these materials from single molecules up to molecular assemblies. Chromophore non-linear optical activity is characterized using frequency-agile hyper-Rayleigh spectroscopy. The intensity of hyper-Rayleigh scattering can be used to determine the non-linear optical performance of individual chromophores. Material characterization of chromophore-polymer composite materials is performed using linear and non-linear optical microscopy. These techniques combine 3-dimensional spatial resolution with single-molecule sensitivity allowing for detailed studies of chromophore-polymer composite materials. Our experimental results are directly compared to theory, with this synergistic approach providing for the development of more accurate theoretical methods thereby increasing the predictive ability of these techniques. We are also collaborating with the Kahr group (New York University) in the study of molecules isolated in organic crystals. The Kahr group has demonstrated that when crystals of potassium hydrogen phthalate (KAP) are grown from aqueous solution in the presence of chromophores, the chromophores are incorporated into specific growth sectors of the crystal with the optical properties of the resulting crystal demonstrating that the chromophores are aligned. Our group performs single-molecule confocal microscopy studies of these materials. By measuring fluorescence dichroism, the orientation of each molecule can be determined and compared to bulk studies. In addition, we are studying the photophysical and emissive behavior in these composite systems. The blinking dynamics observed in many other single-molecule studies are dramatically reduced when the chromophores are incorporated into the crystal. In addition, those molecules that do blink demonstrate remarkably rich photophysical behavior. We are exploring the fundamental reasons behind this behavior using a variety of experimental and theoretical techniques.

近期论文

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C. C. Cooksey and P. J. Reid, "Femtosecond Pump-Probe Studies of Dichlorine Monoxide in Solution," Journal of Physical Chemistry A, 107, 5508-5514 (2003). J. B. Benedict, P. M. Wallace, P. J. Reid, S.-H. Jang, and B. Kahr, "Up-conversion Luminescence in Dye Doped Crystals of Potassium Hydrogen Phthalate," Advanced Materials, 15, 1068-1070 (2003). C. Brooksby, O. V. Prezhdo, and P. J. Reid, "Molecular Dynamics Simulation of Photo-Excited OClO Solvation by Water," Journal of Chemical Physics, 118, 4563-4572 (2003). P. M. Wallace, J. C. Bolinger, S. C. Hayes and P. J. Reid, "On The Actinic Wavelength Dependence of OClO Photochemistry In Solution," Journal of Chemical Physics, 118, 1183-1190 (2003). P. J. Reid, C. Loftus, and C. C. Beeson, "Evaluating the Potential of fluorinated Tyrosines as Spectroscopic Probes of Local Protein Environment: A UV Resonance Raman Study," Biochemistry, 42, 2441-2448 (2003). B. P. Barham and P. J. Reid, "UV Resonance Raman Studies of NOCl in Solution," Chemical Physics Letters, 361, 49-56 (2002). S. C. Hayes, P. Wallace, J. Bolinger, and P. J. Reid†, "Investigating the Phase-Dependent Photochemical Reaction dynamics of Chlorine Dioxide using Resonance Raman Spectroscopy," (invited), International Reviews in Physical Chemistry, T. S. Zwier and J. Huston, Eds., Taylor and Francis, LTD, London, vol. 21, pp. 404-432 (2002).