Effects of nuclear motion

Date: 
Monday, April 13, 2015 (All day)
Speaker: 
Jeffrey Cina
Speaker's Institution: 
University of Oregon

Molecular vibrations, along with the motion of protein- or solvent-host atoms, are known to exert important influence on the time-course of electronic excitation transfer in both model complexes and photosynthetic light-harvesting antennas. The spatial transport of electronic excitation energy has been investigated by numerous labs in recent years with a variety of ultrafast electronic spectroscopic methods. Transient absorption measurements on the antennas of cryptophyte algae [S. D. McClure, D. B. Turner, P. C. Arpin, T. Mirkovic, and G. D. Scholes, "Coherent Oscillations in the PC577 Cryptophyte Antenna Occur in the Excited Electronic State," J. Phys. Chem. B 118, 1296−1308 (2014)] reveal oscillatory quantum beats associated with a number of vibrational modes weakly coupled to the electronic degrees of freedom. I will present initial findings of a collaborative theoretical project aimed at elucidating some key features of these data.