Abstract
The first high-resolution VUV absorption spectrum of hydrogen telluride is reported. Rydberg series of p and d types are assigned whereas the s-type Rydberg series is noticeably absent. Rotational band structures observed in the p and d series are illustrated. The spectrum of deuterium telluride in the VUV is also presented for a study of isotope effects. To the authors' knowledge the most accurate values of the first ionisation potentials for these molecules are given.