Raman spectra of all-trans-β-apo-8′-carotenal in the S1 and T1 states; a picosecond pump-and-probe technique using ML-Qs pulse trains

Add time:08/15/2019    Source:sciencedirect.com

The Raman spectra of all-trans-β-apo-8′-carotenal in the S1 and T1 states have been recorded by a technique using 355 nm pump and 532 nm probe, mode-locked (76 MHz), Q-switched (800 Hz) pulse trains (pulse duration ≈100 ps). The technique takes advantage of the difference in the S1 and T1 lifetimes of the order of 10-11 and 10-6 s, respectively. Thus, the spectrum of the S1 state was obtained by subtraction between a pair of spectra with different delay times, i.e. 0 ps minus 500 ps. The spectrum of the T1 state was obtained by subtracting a probe-only spectrum from a pump-and-probe spectrum (delay time 500 ps).

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