Semi-experimental determination of a repulsive potential curve for hydrogen iodide

Abstract

New measurements of the extinction coefficients of hydrogen and deuterium iodide vapours have been made in the spectral region 32 000 to 52 000 cm^–1. Combining these data with anharmonic vibrational probability functions based on spectroscopic parameters and containing a dependence on rotational quantum number has permitted calculation of potential curves for the repulsive upper state of the continuum of the electronic transition. Separate, apparently distinct potential curves for HI and DI were obtained, but accumulated experimental inaccuracies are probably responsible for the discrepancies. The equation describing the repulsive potential curve of HI is V(x)= 25 707 +(20 982±84) exp [(–5.350±0.049)x].