The resonant two-photon ionization (R2PI) spectra of jet-cooled C6H5NH2, C6H5NHD, C6H5ND2, C6D5NH2, C6D5NHD, and C6D5ND2 resulting from the S1 S0 electronic transition have been simultaneously recorded in three different sample mixtures. New data on C6H5NHD and C6D5NHD are presented for the first time. The observed R2PI spectral bands of these species are successfully assigned on the basis of observed frequency shifts in some vibrational modes of deuterated species and calculated ab initio values. On the basis of mass separation and optical spectral analyses, this method provides an unambiguous means for the simultaneous and selective detection of isotopically substituted anilines presented in the mixture.

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