Climbing the bending vibrational ladder in (DCN)-C-13-N-15 by hot gas emission spectroscopy

Using a newly constructed Fourier transform emission apparatus, we have mea sured the threefold substituted HCN isotopomer, (DCN)-C-13-N-15, at 1370 K in the range from 450 to 700 cm(-1). We could assign hot bands with upper s tates up to nu(2)(1) = 12(12). The assignments have been verified for state s up to nu(2) = 5 by fitting with earlier room temperature absorption measu rements of overtone and hot bands. The intensities are shown to be in quali tative agreement with the expected intensity pattern for such emission spec tra. All the measurements for (DCN)-C-13-N-15 have been combined in a singl e least-squares fit that includes approximately 2700 rovibrational lines wh ich have a root-mean-square deviation on the order of 0.000 4 cm(-1). The s pectroscopic constants for the bending states nu(2) = 1,...,12 are reported , as well as for some combination states involving the other vibrational mo des. We also give the spectroscopic constants of various states of DCN, (DC N)-C-13-N-14, and (DCN)-C-12-N-15 which where obtained from room temperatur e absorption measurements, (C) 1999 Academic Press.