Rotationally resolved electronic spectroscopy of aniline excited vibronic levels

Experiments of molecular beam high resolution electronic spectroscopy were performed on several vibronic bands of the S-1 <-- S-0 electronic transitio n of aniline. Here we report on the properties of the excited states with a vibrational energy up to 1300 cm(-1) above the fundamental vibrational lev el of SI. The spectroscopic parameters of these levels, such as band center s and rotational constants, have been determined with high accuracy from th e fit of more than 300 ro-vibronic transitions for each band. Each single r o-vibronic transition was found to be homogeneously broadened by about 18 M Hz and no evidence of spectral perturbation was detected. (C) 2001 Elsevier Science B.V. All rights reserved.