Figure 1: Probing chiral wave packet dynamics in LH2. | Nature Communications

Figure 1: Probing chiral wave packet dynamics in LH2.

From: Dynamic localization of electronic excitation in photosynthetic complexes revealed with chiral two-dimensional spectroscopy

Figure 1

A series of 3 fs laser pulses (a) probe chiral optical response within LH2 using a chirally sensitive polarization scheme. The LH2 complex (b) contains two rings of bacteriochlorophyll a chromophores (phytyl tails and functional groups removed for clarity). Excitations within the inner ring correspond semiclassically to wave packets that travel around the ring in opposing directions, largely corresponding to k=±1. Higher order k states will also contribute to the response. Interactions with the surrounding protein leads to scattering events that cause the wave pack to reverse direction. The spectroscopy yields chiral maps (c) of the relaxation dynamics.

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