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The analysis of the high resolution FT-IR spectra of the perpendicular bands v 7  (E') at about 1550 cm  -1  and V 9  (E') at about 1170 cm  -1  of the isotopomers  12 C 3  14 N 3 H 3  ,  13 C3  14 N 3 H 3  , and  l2 C 3  I5 N 3 H 3  is given. Both bands proved to be free from accidental resonances. The molecular constants of the state v 7  = 1 and v 9  = 1 of the isotopomers under consideration are listed. The weak difference band v 9 -v l4  (E" → E') of  12 C 3  14 N 3 H 3  was recorded and analyzed, using the molecular constants of v 9  = 1 [this work] and V 14  = 1 [of 1995], This analysis proves the quality of the molecular constants of the fundamental v 14  which is IR-inactive.

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FT-IR Study of the Perpendicular Bands of 1,3,5-Triazine I:* The v 7  and v 9  Bands of  12 C 3  14 N 3 H 3  ,  13 C 3  14 N 3 H 3 ,  12 C 3  15 N 3 H 3  and the Difference Band v 9 -v 14  of  12 C 3  14 N 3 H 3