Table 1.

Geometry of the pCA chromophore after refinement.

	dark	3 ps	10 ps	30 ps	80 ps	100 ps
aNext	--	16	30	29	29	40
H-bond [Å] pCA to E46	2.55	3.30	2.82	2.87	2.86	2.79
H-bond [Å] pCA to Y42	2.58	2.57	2.65	2.62	2.64	2.39
φtail [°]	172	39	51	54	40	30

^acharacteristic N used to calculate extrapolated maps

The length of the hydrogen bonds from the pCA head hydroxyl to Glu 46 and Tyr 46 as well as the torsional angle φ of the pCA tail defined by pCA carbon atoms C1, C2, C3 and C1’ is shown. For the tail in the trans configuration φ is close to 180°, in the cis configuration φ it is close to 0°.