Femtosecond anisotropy excitation spectroscopy to disentangle the Q _x and Q _y absorption in chlorophyll a.

ABSTRACT: Chlorophyll a (Chl a) belongs to the most important and most investigated molecules in the field of photosynthesis. The Q-band absorption is central for energy transfer in photosystems and the relative orientation of the Q _y transitions of interacting chlorophylls governs the energy transfer. Chl a was well investigated, but a quantitative separation of Q _x and Q _y contributions to the Q-band of the Chl a absorption spectrum is still missing. We use femtosecond Vis-pump - IR-probe anisotropy excitation spectroscopy to disentangle the overlapping electronic Q _x and Q _y contributions quantitatively. In an anisotropy excitation spectrum we trace the dichroic ratio of a single

SUBMITTER: Zahn C 

PROVIDER: S-EPMC9629125 | biostudies-literature | 2022 Nov

REPOSITORIES: biostudies-literature