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Inhomogeneous absorption spectrum of protoporphyrin–IX-substituted myoglobin in a glycerol/water glass and of protoporphyrin IX in a glycerol/dimethylformamide glass. Concentrations: myoglobin in glycerol/water, 290 mg: 2.5 ml:1 ml; protoporphyrin IX in glycerol/dimethylformamide = 0.25 mg: 2.5 ml:1 ml. Temperature is 100 mK. The arrow indicates where hole burning was performed. (Inset) The chromophore.
