FOURIER TRANSFORM EMISSION SPECTROSCOPY OF THE $A^{\prime 1}\Pi X^{1}\Sigma^{+}$ AND $A{^{1}}\Pi-X^{1}\Sigma^{+}$ SYSTEMS OF IrN
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Date
1998
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Ohio State University
Abstract
The emission spectrum of IrN has been investigated in the $10000-20000 cm^{-1}$ region at $0.02 cm^{-1}$ resolution using a Fourier transform spectrometer. The bands were excited in a Ir hollow cathode lamp with a discharge of a mixture of 2 Torr of He and a trace of $N_{2}$. Numerous bands have been classified into two transitions labelled as $A{^{1}}\Pi X^{1}\Sigma^{+}$ and $A^{\prime 1}\Pi X^{1}\Sigma^{+}$ by analogy with the isoelectronic PtC molecule. Ten bands involving vibrational level up to $v=4$ in the ground and excited states have been identified to belong to the $A{^{1}}\Pi X^{1}\Sigma^{+}$ transition, previously observed by Marr et al. [J. Chem. Phys. 104, 8183 (1996)]. To lower wavenumbers, five additional bands with R heads near $12021 cm^{-1}, 12816 cm^{-1}, 13135 cm^{-1}, 14136 cm^{-1}$ and $15125 cm^{-1}$ have been assigned as the $0-1, 3-3, 0-0, 1-0$ and 2-0 bands of the new $A^{\prime 1}\Pi X^{1}\Sigma^{+}$ transition. A rotational analysis of these bands has been carried out and the equilibrium constants for the ground and excited states have been extracted. The $v=2$ and 3 vibrational levels of the $A{^{1}}\Pi$ state interact with the $v=0$ and 1 vibrational levels of the $A{^{1}}\Pi$ state causing global perturbations in the bands. The ground state equilibrium constants for IrN obtained from this work are: $\omega_{e}=1126.1752(22) cm^{-1}, \omega_{e}x_{e}=6.2892(12) cm^{-1}, B_{e}= 0.5001047(28) cm^{-1}, \alpha_{a}= 0.0031995(27) cm^{-1}$ and $r_{r}= 1.6068254(45)${\AA}.
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Author Institution: Department of Chemistry, University of Arizona; Department of Chemistry, University of Waterloo