Simultaneous Detection of C ₆ H ₅ NHD, C ₆ H ₅ ND ₂ , C ₆ D ₅ NH ₂ , C ₆ D ₅ NHD, and C ₆ D ₅ ND ₂ by Resonant Two-Photon Ionization Mass Spectrometry

Abstract

The resonant two-photon ionization (R2PI) spectra of jet-cooled C 6 H 5 NH 2 , C 6 H 5 NHD, C 6 H 5 ND 2 , C 6 D 5 NH 2 , C 6 D 5 NHD, and C 6 D 5 ND 2 resulting from the S 1 ← S 0 electronic transition have been simultaneously recorded in three different sample mixtures. New data on C 6 H 5 NHD and C 6 D 5 NHD 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.