Figure 3. Absorption spectrum (curve a) and flash difference spectrum (curve b) immediately after laser flash (694.3 nrn) excitation of deoxygenated chlorophyll b (9.5 XM) in rnethylcyclohexane-methanol (0.05 M) at-78" C: 1= 0.23 crn. Arrows indicate absorbance scales for curves a and b.