Abstract
The relative energies of several conformations of the tryptophol cation are determined by zero kinetic energy (ZEKE) photoelectron spectroscopy and photoionization efficiency measurements. Recently published high-resolution electronic spectroscopy on the neutral species determined the absolute configuration of the different conformers in the S1 spectrum. These assignments are utilized in the photoelectron experiments by pumping through conformer specific S1 resonances yielding ZEKE spectra of the specific, assigned conformations. The adiabatic ionization of one specific conformation is definitively determined, and two others are estimated. The photoelectron spectra, coupled with calculations, reveal that structural changes upon ionization are dominated by interactions of the hydroxyl group with the changes of electronic structure in the aromatic system.
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