Reflection-absorption IR spectrum of chlorine adatoms on the silver(100) surface

The IR spectrum of chlorine adsorbed on the silver(100) surface has been recorded using the new IR beamline at the Daresbury Synchrotron Radiation Source: the performance of this facility in the far-IR region is shown to be comparable with the best that has been achieved in the mid-IR. An absorption band corresponding to the metal-chlorine stretching vibration was observed at 228 cm-1. Analysis of the intensity of this band indicates that the silver-chlorine bond exhibits significant ionic character, in agreement with recent cluster calculations.