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. 1998 May 12;95(10):5550–5555. doi: 10.1073/pnas.95.10.5550

Figure 3.

Figure 3

Comparison of aqueous ionization energies of indole and tryptophan obtained by using the present methods with experimental threshold energies for conduction-band ionization. The orbital diagram describes the highest occupied molecular orbital in indole and tryptophan. Experimental threshold energies and data were taken from ref. 25.