Bibliography 553
1.2
1.0
0.8
0.6
0.4
0.2
0.0
0.2
0.4
11010
1
Delay time (ps)
Absorbance change [a.u.]
10
2
10
3
Figure 11.14 Transient absorption changes for native reaction centers at 1.02 µm associated with
the photosynthesis. The large initial absorption increase has a time constant of 0.9 ps. It is related to
the absorption change due to the formation of a bacteriochlorophyll anion (from Zinth et al. [49]).
electron transfer to the bacteriopheophytin H
A
is faster, taking only 0.9 ps. In the
experiment, after the main absorption band of the pigment is pumped, a probe is
sent in the near IR, where the bacteriochlorophyll anions (P
+
B
−
A
) have a strong
absorption. The transient absorption change at 1.02 µm is shown in Figure 11.14.
The 0.9 ps time constant would correspond to the electron transfer from the
bacteriochlorophyll to the bacteriopheophytin (P
+
H
−
A
).
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