ULTRAFAST  SPECTROSCOPY

  Broadband 2D electronic spectrum of LHCII, which maps out excited states and dynamics across the visible region.             

Broadband 2D electronic spectrum of LHCII, which maps out excited states and dynamics across the visible region.

 

 

 

 

We use ultrafast transient absorption and two-dimensional electronic spectroscopy experiments to interrogate excited state dynamics, including energy transfer, charge transfer, and vibrational relaxation. Transient absorption spectroscopy allows quantitative determination of kinetics on the femto- to picosecond timescale. In parallel, we overcome the limitations associated with narrow spectral bandwidths by introducing a sub-10 fs, ultrabroadband laser spectrum to our two-dimensional electronic spectroscopy (2DES) apparatus, which encompasses the entire visible range (450-800 nm). Ultrabroadband 2DES can be applied to uncover previously inaccessible dynamics of energy flow in a wide variety of condensed-phase systems, including natural and artificial light harvesting systems as well as organic and inorganic nanomaterials.

M. Son, S. Mosquera-Vasquez, G. S. Schlau-Cohen, "Ultrabroadband 2D electronic spectroscopy with high-speed, shot-to-shot detection." Opt Express25, 18950 (2017).

Group Members: Minjung, Ashley, Olivia, Steph