The emission spectrum of IrN has been investigated in the 10 000-20 000 cm(-1) region at 0.02 cm(-1) resolution using a Fourier transform spectrometer. The bands were excited in an Lr hollow cathode lamp operated with a mixture of 2 Torr of Ne and a trace of N-2. Numerous bands have been classified into two transitions labeled as A(1)II-X(1)Sigma(+) and A' (II)-I-1-X(1)Sigma(+) by analogy with the isoelectronic PtC molecule. Ten bands involving vibrational levels up to v = 4 in the ground and excited states have been identified in the A(1)II-X(1)Sigma(+) transition. This electronic transition has been previously observed by [A. J. Marr, M. E. Flores, and T. C. Steimle, J. Chem. Phys. 104, 8183-8196 (1996)]. To lower wavenumbers, five additional bands with R heads near 12 021, 12 816, 13 135, 14 136, and 15 125 cm(-1) have been assigned as the 0-1, 3-3, 0-0, 1-0, and 2-0 bands, respectively, of the new A' (II)-I-1-X(1)Sigma(+) transition. A rotational analysis of these bands has been carried out and equilibrium constants for the ground and excited states have been extracted. The v = 2 and 3 vibrational levels of the A' (II)-I-1 state interact with the v = 0 and 1 levels of the A(1)II: state and cause global perturbations in the bands. The ground state equilibrium constants for (IrN)-Ir-193 are: omega(e) = 1126.176360(61) cm(-1), w(e)x(e), 6.289697(32) cm(-1), B-e = 0.5001033(20) cm(-1), alpha(e) = 0.0032006(20) cm(-1), and r(e), = 1.6068276(32) Angstrom. (C) 1999 Academic Press.
|Number of pages||13|
|Journal||JOURNAL OF MOLECULAR SPECTROSCOPY|
|Publication status||Published - Feb 1999|
- DIATOMIC FEN