Abstract
The high-resolution threshold photoelectron spectrum of the HF molecule has been measured using pulsed field ionization after single-photon excitation by coherent vacuum ultra-violet radiation. The adiabatic ionization potential for HF was found to be 129422.4±1 cm −1. In contrast to HCl, only small changes in total angular momentum of the ion core are observed. The experimental results show a preference for the F 1 spin—orbit component for both vibrational states of the ion, whereas the vibrational branching ratio was found to be similar to the relative intensities obtained from the Franck-Condon principle.
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