Chl
2
*
Chl
1
*
Chl
3
*
Chl
4
*
P700*
P700
+
A
0
–
P700
+
A
–
P700
+
Q
K
–
Free energy
P700 appears to be oxidized
without concurrent reduction of
acceptor chlorrophyll
23 ps
0.8 ps
(0.2
ps)