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Transient absorption (A and C) and anisotropy (R) (B and D) of 1 (Δ isomer) in water on two different time scales. The pump wavelength was 502 ± 2 nm, and the probe wavelength was 566 ± 2 nm. Time constants are indicated. Inclusion of a long lifetime decay (with an amplitude of 6–14% at all wavelengths) was required for a good fit of the relaxation to the ground state (see text).
