Two-dimensional FT-IR correlation analysis of the chemisorption of nitric oxide on Pt(100)

In addition to the previously reported vibrational frequencies of NO stretch at 1591-1650 cm(-1) and 1770-1800 cm(-1) on Pt(100) surface at 300 K, we observed an infrared spectral band centered around 1689-1692 cm(-1). With the use of two-dimensional IR correlation analysis, we were able to distinguish the various adsorption sites of NO under the present experimental conditions. The infrared band at 1689-1692 cm(-1) developed independently of the band at 1639-1653 cm(-1). By varying the pressure of NO and the surface temperature, we were able to demonstrate that the 1689-1692 cm(-1) band grows only at higher NO pressure and lower surface temperature.