Abstract
Low-energy (5−40 eV) electron-stimulated desorption (ESD) of D (1 2S) from amorphous D2O water films has been studied using laser resonance-enhanced multiphoton ionization spectroscopy. The D (1 2S) desorption product has a ∼6.5 ± 0.3 eV threshold energy, relative to the vacuum level, and a low velocity distribution. ESD of electronically excited D (n ≥ 2 2S) was not detected using photoionization schemes. A small metastable (n ≥ 2 2P) desorption yield and/or emission of ultraviolet (UV) photons (hν ≥ ∼6 eV) was detected at incident electron energies >25 eV, using a multichannel plate detection technique. We attribute the ground state D desorption to exciton decay and associate the small metastable/UV photon emission yield with dissociation of doubly excited states and efficient autoionization.
Published Version
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