Isomerization reaction in high-n Rydberg states of phenol-Ar/Kr clusters measured by autoionization detected infrared spectroscopy

► Infrared spectra of phenol-rare gas clusters in high-n Rydberg states were measured. ► Both free and hydrogen-bonded OH stretching vibrations were observed in the infrared spectra. ► π → H site switching of rare gas was observed even in high-n Rydberg states.