Abstract
H 2 and N 2 physisorbed on a Ag(111) surface are investigated by means of high-resolution electron-energy loss spectroscopy with an energy resolution on 3 meV. The incident electron energy is tuned to negative ion resonances at 3 eV for H 2 and 1.5 eV for N 2, and high probability for inelastic electron scattering due to combined vibrational and rotational modes is observed. The external H 2-surface (out-of-plane) vibration and its overtones are found at 8.55, 14.8 and 19.0 meV, well separated from the rotational modes. For N 2, anticipated external rotational and translational modes overlap and give rise to structureless inelastic tails of the N 2 stretching vibration and its overtones.
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