Spectroscopic investigation of tetrahydroisoquinoline in supersonic jet

Fluorescence excitation and dispersed emission spectra of tetrahydroisoquin oline are presented here. Two bands at 36 781 and 36 884 cm(-1) are confirm ed from the spectral hole burning studies as two origins for two conformers . These bands correspond to the inequivalent twist conformers with the hydr ogen atom attached to the nitrogen atom at axial and equatorial positions, respectively. The former is found to be the most stable one. SVL spectra ar e explained on the basis of two theoretically calculated low-frequency vibr ations. These correspond to the butterfly and puckering motions of the benz ene chromophore, respectively. (C) 2001 American Institute of Physics.