The vibronic band systems of (benzene)(n) clusters in the S-1-S-0 region are revisited by mass-selective resonant two-photon ionization and ultraviolet-ultraviolet hole burning spectroscopies. A detailed examination of the spectra of isotopomers composed of C6H6 and C6D6 reveals that there is substantial fragmentation following photoionization for the trimer and the tetramer. Transitions which have been assigned to the trimer are most probably due to the tetramer. Instead, reassigned to the trimer is the band system which has been believed to be of an isomeric form of the dimer. (C) 2001 American Institute of Physics.