The photoionization spectrum of HD has been recorded in the region of the first vibrationally excited level (v+ = 1) of the X 2Σ+g ground state of the HD+ ion using a narrow bandwidth vacuum ultraviolet (VUV) laser. Spectral positions, intensities and line widths are reported for all resonances observed between 126 100 and 126 700 cm−1. The np Rydberg series converging to the v+ = 1, N+ = 0 and 2 states of the ion have been observed up to n = 150 and used to determine the corresponding ionization thresholds in a multichannel quantum defect theory analysis. After subtraction of the ionic vibrational energy the adiabatic ionization energy of HD was determined to be 124 568.491 ± 0.017 cm−1. Several low n interloper Rydberg states converging to higher vibrational levels (v+ > 1) of HD+ have also been observed and their interaction with the v+ = 1 channel is discussed.
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Greetham et al. (2003) studied this question.