Abstract
Fourier absorption spectra of HI and DI were recorded simultaneously in a very large spectral range and the results enabled the prediction of the 1 ← 0 band of TI. For the wavenumbers of most lines, the absolute accuracy was estimated to be better than 2 × 10 −7 × σ. The TI spectrum was calculated with an estimated precision of 20 × 10 −3 cm −1 by extrapolation from the HI and DI spectra through a Dunham analysis corrected for the Born-Oppenheimer approximation. In the course of this experiment, Doppler-limited electricquadrupole hyperfine structures were detected for low J lines of the first overtone bands.
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