Identification of isotopomers in natural abundance using two dimensional laser induced fluorescence: S1-S0 spectral shifts for the four 13C isotopomers of fluorobenzene

► 000 spectral shifts are reported for the four fluorobenzene 13C isotopomers. ► Spectral separation using 2-dimensional laser induced fluorescence (2D-LIF). ► 2D-LIF separates overlapped spectra of species with identical masses. ► Assignments determined from ab initio vibrational frequency calculations. ► 13C vibrational frequency shifts test ab initio vibrational force fields.