个人简介

Ph.D. 2004, University of California, Berkeley

研究领域

Ultrafast spectroscopy of molecular dynamics in photochemistry/Mechanisms of vibrational relaxation.

Our lab is developing new ultrafast vibrational techniques to study the nuclear geometry changes during ultrafast photochemical and photobiological reactions and the vibrational coupling that allows energy flow in small molecules. Our primary tool for these studies is a laser spectroscopy technique called femtosecond stimulated Raman spectroscopy, or FSRS, that allows the collection of high-resolution vibrational spectra with time-resolution better than 100 fs (see Figures 1 and 2 below). The power of FSRS is that it allows collection of a complete vibrational spectrum of a reacting molecule with unprecedented time resolution. This enables the determination of molecular structure as a molecule moves through transition states on the excited-state or ground-state potential energy surface. In one set of projects, FSRS is being used to determine structural changes during charge-transfer events and during the extremely short-lived electronic excited states of DNA (Figure 3). Additionally, our lab will be studying vibrational coupling by impulsively driving molecular vibrations and then observing the movement of the vibrational excitation through the molecule

近期论文

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Lee, J., Challa, J.R., McCamant, D.W. Pump Power Dependence in Resonance Femtosecond Stimulated Raman Spectroscopy. Journal of Raman Spectroscopy. 2013, 44, 1263-1272. Dunlap, B., Wilson, K.C., McCamant, D.W. Phase-Matching and Dilution Effects in Two Dimensional Femtosecond Stimulated Raman Spectroscopy Journal of Physical Chemistry A, (Part of the "John Wright Festschrift"). 2013, 117, 6205-6216. Peuntinger, K., Lazarides, T., Daphnomili, D., Charalambidis, G., Landrou, G., Kahnt, A., Sabatini, R., McCamant, D., Gryko, D.T., Coutsolelos, A.G., Guldi, D.M. "Photoinduced Charge Transfer in Porphyrin-Cobaloxime and Corrole-Cobaloxime Hybrids." Journal of Physical Chemistry C. 2013, 117, 1647-1655. Rhinehart, J.M., Challa, J.R., McCamant, D.W. "Multimode Charge-Transfer Dynamics of 4-(Dimethylamino)Benzonitrile Probed with Ultraviolet Femtosecond Stimulated Raman Spectroscopy, (Part of the "Richard A. Mathies Festschrift")." Journal of Physical Chemistry B. 2012, 116, 10522-10534. Challa, J.R., Du, Y., McCamant, D.W. "Femtosecond stimulated Raman spectroscopy using scanning multichannel technique." Applied Spectroscopy 2012, 66, 227-232. McCamant, D. W. "A re-evaluation of rhodopsin’s relaxation kinetics determined from femtosecond stimulated Raman lineshapes," Journal of Physical Chemistry B. 2011, 115, 9299. Sabatini, R. P., McCormick, T. M., Lazarides, T., Wilson, K. C., Eisenberg, R., McCamant, D. W. "Intersystem crossing in halogenated Bodipy chromophores used for solar hydrogen production," Journal of Physical Chemistry Letters 2011, 2, 223. Lazarides, T., McCormick, T., Wilson, K., Lee, S., McCamant, D. W., Eisenberg, R. "Sensitizing the sensitizer: The synthesis and photophysical study of Bodipy-Pt(II)(diimine)(dithiolate) conjugates," Journal of the American Chemical Society 2011, 133, 350. Rhinehart, J. M., Mehlenbacher, R. D., McCamant, D. W. "Probing the charge transfer reaction coordinate of 4-(dimethylamino)benzonitrile with femtosecond stimulated Raman spectroscopy," Journal of Physical Chemistry B. 2010, 114, 14646. Mehlenbacher, R., Lyons, B., Wilson, K., Du, Y., McCamant, D. W. "Theoretical analysis of anharmonic coupling and cascading Raman signals observed with femtosecond stimulated Raman spectroscopy," Journal of Chemical Physics 2009, 13, 244512. Dance, Z. E. X., Ahrens, M. J., Vega, A. M., Ricks, A. B., McCamant, D. W., Ratner, M. A., and Wasielewski, M. R. "Direct observation of the preference of hole transfer over electron transfer for radical ion pair recombination in donor-bridge-acceptor molecules," J. Am. Chem. Soc. 2008, 130, 830. Kukura, P., McCamant, D. W., Mathies, R. A. "Femtosecond Stimulated Raman Spectroscopy," Annual Review of Physical Chemistry 2007, 58, 461-488. Dance, Z. E. X., Mi, Q., McCamant, D. W., Ahrens, M. J., Ratner, M. A., Wasielewski, M. R. "Time-Resolved EPR Studies of Photogenerated Radical Ion Pairs Separated by p-Phenylene Oligomers and of Triplet States Resulting from Charge Recombination," J. Phys. Chem. B 2006, 110, 25163-25173. Mi, Q., Chernick, E. T., McCamant, D. W., Weiss, E. A., Ratner, M. A., Wasielewski, M. R. "Spin dynamics of photogenerated triradicals in fixed distance electron donor-chromophore-acceptor-TEMPO molecules," J. Phys. Chem. A 2006, 110, 7323-7333. Kukura, P., McCamant, D. W., Yoon, S., Wandschneider, D. B., Mathies, R. A. "Structural observation of the primary isomerization in vision with femtosecond stimulated Raman," Science 2005, 310, 1006-1009. Kukura, P., McCamant, D. W., Yoon, S., Wandschneider, D. B., Mathies, R. A. "Structural observation of the primary isomerization in vision with femtosecond stimulated Raman," Science 2005, 310, 1006-1009. McCamant, D. W., Kukura, P., Mathies, R. A. "Femtosecond stimulated Raman study of excited-state evolution in bacteriorhodopsin," J. Phys. Chem. B 2005, 109, 10449-10457. McCamant, D. W., Kukura, P., Yoon, S., Mathies, R. A. "Femtosecond broadband stimulated Raman spectroscopy: Apparatus and methods," Rev. Sci. Instrum. 2004, 75, 4971-4980. Lee, S. Y., Zhang, D., McCamant, D. W., Kukura, P., Mathies, R. A. "Theory of femtosecond stimulated Raman spectroscopy," J. Chem. Phys. 2004, 121, 3632-3642. Kukura, P., McCamant, D. W., Davis, P. H., Mathies, R. A. "Vibrational structure of the S2 (1Bu) excited state of diphenyloctatetraene observed by femtosecond stimulated Raman spectroscopy," Chem. Phys. Lett. 2003, 382, 81-86. McCamant, D. W., Kukura, P., Mathies, R. A. "Femtosecond time-resolved stimulated Raman spectroscopy: Application to the ultrafast internal conversion of β-carotene," J. Phys. Chem. A 2003, 107, 8202-8214.