A Fourier-transform spectral-ratioed reinvestigation of the infrared spectra from H2 and D2 adsorbed on ZnO at room temperature and at 160 °C

Abstract

Ratio-recorded Fourier-transform infrared spectra from H₂ and D₂ adsorbed on Kadox 15 zinc oxide have provided better quality data than previously, particularly in the low-wavenumber region 1200–600 cm^–1 which is overlapped by multi-phonon absorptions involving ZnO lattice fundamentals. No evidence was found for a band at 1125 cm^–1 postulated from inelastic neutron scattering work and attributed to a δ(OH) mode from type I adsorbed hydrogen. On the other hand, the presence of two absorptions at 840 and 820 cm^–1, attributed to δ(OH) and δ(ZnH) modes, was confirmed. Absorptions from type II adsorbed hydrogen were also recorded.