Abstract
We present here new high-resolution experimental data on the linestrengths and pressure-broadened Lorentzian widths for the P 2(13) to R 2(12) vibration–rotation lines in the first overtone absorption band of hydrogen iodide. By combining the measured linestrengths with our previous results for the fundamental band [J. Mol. Spectrosc. 218 (2003) 75] and with other published data for the higher-overtone bands of this molecule, an improved dipole moment expansion as a function of the dimensionless reduced nuclear displacement x is obtained: μ( x)=0.4471(5)−0.0772(2) x+0.542(3) x 2−1.90(2) x 3. This experimental dipole moment function is compared with the results of a few recent non-relativistic and relativistic ab initio calculations. The agreement between theoretical and experimental Herman–Wallis coefficients for the first two vibrational bands of HI is found best as ever reported before.
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