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Measuring the Ultrafast Correlation Dynamics between the Qₓ and Qy Bands in Chlorophyll Molecules
- Khyasudeen, M. Faisal, Nowakowski, Paweł J., Tan, Howe-Siang
- TheJournal of physical chemistry 2019 v.123 no.6 pp. 1359-1364
- chlorophyll, physical chemistry, spectroscopy
- We use two-dimensional electronic spectroscopy to measure the ultrafast correlation dynamics between the Qₓ and Qy transitions in chlorophyll molecules. We derive a variation to the center line slope method to quantify the frequency fluctuation cross-correlation function, Cₓy(Tw). Compared with the frequency fluctuation correlation function of the Qy transition, we observe that there is only a minimal correlation between the Qₓ and Qy transition, even at the ultrashort timescale of ∼100 fs, which then decays to zero in a time scale of ∼2 ps.