Abstract
Photon-stimulated desorption of H− ions has been observed from a BaO surface for photon energies in the range of 3–5 eV, with a yield that increases sharply for energies above the threshold at 3 eV. A possible explanation is that a chemisorbed H atom captures a photoemitted electron and desorbs as H− via the Menzel–Gomer–Redhead mechanism.
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