https://www.nist.gov/publications/rotationally-resolved-uv-spectroscopy-rotamers-indole-4-carboxylic-acid-evidence-charge
Rotationally resolved electronic spectra of two conformational isomers of jet-cooled Indole-4-Carboxylic Acid (I4CA) and the deuterated forms of the acid (COOD)
uv spectroscopyresolvedrotamersindole