Vibrational and rotational modes of physisorbed H2 and N2 on Ag(111) surfaces

Gruyters, Markus Thomas Albert; Jacobi, Karl

doi:10.1016/0009-2614(94)87086-1

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Vibrational and rotational modes of physisorbed H₂ and N₂ on Ag(111) surfaces

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Gruyters, Markus Thomas Albert
Fritz Haber Institute, Max Planck Society;

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Jacobi, Karl
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Citation

Gruyters, M. T. A., & Jacobi, K. (1994). Vibrational and rotational modes of physisorbed H₂ and N₂ on Ag(111) surfaces. Chemical Physics Letters, 225(4-6), 309-314. doi:10.1016/0009-2614(94)87086-1.

Cite as: https://hdl.handle.net/21.11116/0000-0009-9DB3-C

Abstract

H₂ and N₂ 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 H₂ and 1.5 eV for N₂, and high probability for inelastic electron scattering due to combined vibrational and rotational modes is observed. The external H₂-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 N₂, anticipated external rotational and translational modes overlap and give rise to structureless inelastic tails of the N₂ stretching vibration and its overtones.