Abstract
Vibrational infrared spectroscopy has been used for the first time to study adsorption on insulator single crystal surfaces. Different carbon dioxide isotopes adsorbed on NaCl(100) have been investigated with FTIR-spectroscopy at low temperatures (≦80 K) under UHV. For submonolayer coverages the ν 3 absorption band of e.g. 12 C 18 O 2 is centered at 2304 cm −1 . This band saturates without a measurable frequency shift at monolayer coverage and a second band at 2314 cm −1 appears, assigned to the second layer, growing upon further gas admission. In a 12 C 16 O 2 / 13 C 16 O 2 coadsorbate at submonolayer and monolayer coverage the observed spectrum contains all bands at the same frequencies as found for the pure adsorbates.
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