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Abstract
The infrared-active modes of HOPG have been measured under ultrahigh vacuum conditions. The two vibrational bands have been found to be strongly dependent on the polarization of the incoming IR-beam. Under s-polarization the A 2u-mode is not detectable. After evaporation of potassium onto the cooled HOPG sample the spectra show bands in the vicinity of the E 1u-mode. These bands are characteristic for alkali-graphite intercalation compounds. Preliminary measurements in the far infrared region show a broad and intense band centered at about 270 cm −1.
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