Nature has had 2.4 billion years to evolve and engineer excited state dynamics. From photosynthesis to vision to photoenzymes, we examine natural mechanisms to steer excited states. Our goal is to isolate and identify new design principles to control quantum dynamics.
Electronic excited states carry enough energy to make and break chemical bonds. Photochemistry operates manifestly outside the Born-Oppenheimer regime -- thereby escaping our standard chemical intuition. We seek new strategies to steer excited states and to control their reactivity.
You can't engineer what you can't see. We build new spectroscopic tools to probe femtosecond dynamics of electronic excitations. In living cells, protein complexes, and small molecules, we capture how these systems evolve with unprecedented depth and specificity.
James Anderson (Greg's Ph.D. Adviser) receives the Benton Medal for Distinguished Public Service at UChicago's Convocation ceremony.
We have received funding from the Qatar National Research Foundation to undertake a new project on solar light harvesting in collaboration with Sabre Kais and Fahhad al Harbi at QEERI. We thank QNRF for their support of our work and look forward to this collaborative effort.
P.D. Dahlberg,* P.-C. Ting,* S.C. Massey, E.C. Martin, C.N. Hunter, and G.S. Engel, "Electronic Structure And Dynamics Of Higher-Lying Excited States In Light Harvesting Complex 1 From Rhodobacter sphaeroides" J. Phys. Chem. A (accepted)
M.L. Flanagan, P.D. Long, P.D. Dahlberg, B.S. Rolczynski, S.C. Massey, and G.S. Engel, "Mutations to R. sphaeroides Reaction Center Perturb Energy Levels and Vibronic Coupling but Not Observed Energy Transfer Rates" J. Phys. Chem. A, 120 1479-1487 2016.
C. She, I. Fedin, D.S. Dolzhnikov, P.D. Dahlberg, G.S. Engel, R.D. Schaller, D.V. Talapin, "Red, Yellow, Green, and Blue Amplified Spontaneous Emission and Lasing Using Colloidal CdSe Nanoplatelets" ACS Nano. 9, 9475–9485 2015.
P.D. Dahlberg, G.J. Norris, C. Wang, S. Viswanathan, V.P. Singh, and G.S. Engel , "Communication: Coherences observed in vivo in photosynthetic bacteria using two-dimensional electronic spectroscopy" J. Chem. Phys. 143, 101101 2015.
V. P. Singh, M. Westberg, C. Wang, P. D. Dahlberg, T. Gellen, A. T. Gardiner, R. J. Cogdell, and G. S. Engel, "Towards quantification of vibronic coupling in photosynthetic antenna complexes" J. Chem. Phys. 142, 212446 2015.