个人简介

Ph.D. 2008, Cornell University, Ithaca NY B.A. 2001, Concordia College, Moorhead MN

研究领域

Physical Chemistry

Chemical Dynamics of Photocatalysis: How does light drive energy-storing chemical reactions? Photocatalysis involves absorption of light by electronic resonances in materials and molecules, followed by a series of intricate energy transfer, charge transfer, bond breaking and bond formation processes. The final outcome is that energy from light is stored in chemical bonds. Photocatalysis is the source of almost all bio-energy on Earth. In light of the emerging need for sustainable energy, understanding and harnessing sunlight driven photocatalysis is one of the most important scientific challenges of the present time. To successfully design efficient artificial light harvesting systems, it is necessary to understand the elementary steps of photocatalytic reactions. Many of these elementary steps occur on the ultrafast time-scale (femtoseconds to picoseconds). We will employ state-of-the-art ultrafast laser spectroscopy to initiate electronic excitations in materials and molecules of interest for light harvesting and follow the chemistry that is triggered by them in real time. We will study two general classes of photocatalytic reactions.

近期论文

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Microscopic Quantum Coherence in Photosynthetic Light Harvesting Antenna, J. Dawlaty, A. Ishizaki, A. De, G. Fleming, Philosophical Transactions of Royal Society A (in press). Mapping the Spatial Overlap of Excitons in a Photosynthetic Complex via Coherent Nonlinear Frequency Generation, J. Dawlaty, D. Bennett, V. Huxter, G. Fleming, Journal of Chemical Physics, 135, 044201 (2011). Ultrafast Multidimensional Spectroscopy: Principles and Applications to Photosynthetic Systems, G. Schlau-Cohen, J. Dawlaty, G. Fleming, IEEE Journal of Selected Topics in Quantum Electronics, 99, 1 (2011). Measurement of Ultrafast Carrier Dynamics in Epitaxial Graphene, J. Dawlaty, S. Shivaraman, M. Chandrashekhar, F. Rana, M. G. Spencer, Appl. Phys. Lett., 92, 042116 (2008). Measurement of the Optical Absorption Spectra of Epitaxial Graphene from Terahertz to Visible, J. Dawlaty, S. Shivaraman, J. Strait, P. George, M. Chandrashekhar, F. Rana, M. G. Spencer, D. Veksler, Y. Chen, Appl. Phys. Lett., 93, 131905 (2008). Ultrafast Optical-Pump Terahertz-Probe Spectroscopy of the Carrier Relaxation and Recombination Dynamics in Epitaxial Graphene, P. George, J. Strait, J. Dawlaty, S. Shivaraman, M. Chandrashekhar, F. Rana, M. Spencer, Nano Letters, 8, 12, 4248 (2008). Carrier Recombination and Generation Rates for Intravalley and Intervalley Phonon Scattering in Graphene, F. Rana, P. George, J. Strait, J. Dawlaty, S. Shivaraman, M. Chandrashekhar, M. Spencer, Phys. Rev. B, 79, 115447 (2009). High frequency measurements on an AlN/GaN-based intersubband detector at 1550 and 780 nm, D. Hofstetter, E. Baumann, F. Giorgetta, J. Dawlaty, P. George, F. Rana, F. Guillot, E. Monroy, Appl. Phys. Lett., 92, 231104 (2008). Force-Gradient Detected Nuclear Magnetic Resonance, S. R. Garner, S. Kuehn, J. Dawlaty, N. E. Jenkins, and J. A. Marohn, Appl. Phys. Lett., 84, 5091 (2004). 1 Effects of Noise on Parameter Recovery from Raman Spectrograms, J. Dawlaty, D. Ulness, Journal of Raman Spectroscopy, 32, 211 (2001).