Abstract
The infrared spectrum of yttrium monoiodide has been excited in an electrodeless microwave discharge and explored between 2500 and 12 000cm −1 with a high-resolution Fourier transform spectrometer. A unique system is observed ( ν 00 = 9905.520 cm −1), which we attribute to a 1 Π → 1 Σ transition and an extensive analysis is made. Rovibrational constants are obtained for both states mainly from a simultaneous multiband fitting. This procedure is applied to the whole set of 2231 observed line wavenumbers in the 1-0, 0-0, and 0–1 bands, yielding a final weighted standard deviation of 0.0038 cm −1. Furthermore, a partial analysis of the 2-0 and 3-1 bands is performed. The following equilibrium constants are derived (cm −1): ω′ e=192.210 ω′ ex′ e=0.463 B′ e=0.0399133 α′ e=0.0001150 ω″ e=215.815 ω″ ex″ e=0.514 B″ e=0.0422163 α″ e=0.0001125 High-order constants D v and H v are also calculated for the various vibrational levels ( v′ = 0, 1, 2, 3; v″ = 0, 1).
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