Infrared studies on dinitrogen and dihydrogen adsorbed over TiO2 at low temperatures

Abstract

Infrared spectra of dinitrogen species adsorbed on TiO₂ have been studied at low temperatures (< 273 K). The NN stretching peak was observed at 2337 cm^–1. The extinction coefficient of the NN stretching band is ca. 8 × 10^–20 cm² molecule^–1 and the heat of adsorption is ca. 11 kJ mol^–1. Infrared spectra of dihydrogen adsorbed on TiO₂ were also observed at 4078 and 4030 cm^–1, and the heat of adsorption is ca. 6 kJ mol^–1. The interaction between dihydrogen and dinitrogen adsorbed over TiO₂ was discussed.