Vibrational excitation of physisorbed CO2 on a Ag(111) surface

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Abstract
Vibrational excitations of CO2 molecules physisorbed on Ag(111) at 40 K were measured by high‐resolution electron energy‐loss spectroscopy (EELS). Measurements of EELS were performed at an incident electron energy of 1.5 to 30 eV for exposures of CO2 ranging from 0.5 to 5 L. Vibrational energies of three fundamental vibrational modes coincided with the values for CO2 molecules in the gas phase within ±3 meV. Resonance excitation of the symmetric stretch mode was observed at incident electron energies of 1.5 to 3 and 9 eV. The excitations of (n00) and (n10) progressions were significant at the incident energy of 2 eV, which is related to a 3.8‐eV resonance known for electron–molecule collision in the gas phase.

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