Climbing the Bending Vibrational Ladder in D13C15N by 
Hot Gas Emission Spectroscopy

pp. 284-298 (doi:10.1006/jmsp.1999.7794) 
Wolfgang Quapp*,  Michael Hirsch*,  Georg C. Mellau,  Stefan Klee,  
M. Winnewisser,  Arthur Maki

*Mathematisches Institut, Universität Leipzig, Augustus-Platz, D-04109,
Leipzig, Germany
Physikalisch-Chemisches Institut, Justus-Liebig-Universität Gießen,
Heinrich-Buff-Ring 58, D-35392, Gießen, Germany
15012 24 Avenue S.E., Mill Creek, Washington, 98012-5718


Using a newly constructed Fourier transform emission apparatus, we have
measured the threefold substituted HCN isotopomer, D13C15N, at 1370 K in the
range from 450 to 700 cm-1. We could assign hot bands with upper states up
to v_2= 12^12. The assignments have been verified for states up to v_2= 5 by
fitting with earlier room temperature absorption measurements of overtone
and hot bands. The intensities are shown to be in qualitative agreement with
the expected intensity pattern for such emission spectra. All the
measurements for D13C15N have been combined in a single least-squares fit
that includes approximately 2700 rovibrational lines which have a
root-mean-square deviation on the order of 0.000 4 cm-1. The spectroscopic
constants for the bending states v_2= 1,...,12 are reported, as well as for
some combination states involving the other vibrational modes. We also give
the spectroscopic constants of various states of DCN, D13C14N, and D12C15N
which where obtained from room temperature absorption measurements.

Copyright 1999 Academic Press.