Figure 19. Theoretical calculations via the CFP applied to Eq. (5.69) (v being assumed as infinitely fast) of the effects of excitation on the decay of the angular velocity u. Curves 1 to 4 have the same meaning as in Fig. 18, and curves 2 and 3 correspond to the same excitation parameter as those of Fig. 18. The memory and nonlinearity parameters which best reproduce the experimental results are g = 1.45 and IF = 0.0680. |

Most current interest in u.v. spectra is concerned with retinal and its cis-trans isomers. Studies at 77 K include theoretical calculations, fluorescence, and the effect of protonation on the corresponding Schiff base. The singlet-triplet absorption spectrum of all-trans-retinol has been measured. Calculations on the absorption-emission spectra of rhodopsin suggest that there is little dependence on the angular twist in the polyene chain. Pulse radiolysis has made it [Pg.180]

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