Abstract
We report the first observation of thermally emitted infrared radiation from vibrational modes of molecules adsorbed on clean, single crystal metal surfaces. The observation of emission from CO adsorbed on Ni demonstrates the surface sensitivity of a novel apparatus for infrared vibrational spectroscopy, with a resolution of 1 to 15 cm −1 over the frequency range from 330 to 3000 cm −1 . A liquid helium cooled grating spectrometer measures the thermal radiation from a room temperature, single crystal sample, which is mounted in an ultrahigh vacuum system. Measurements of frequencies and linewidths of CO on a single crystal Ni sample, as a function of coverage, are discussed.
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