Fuchs–Kliewer phonon spectrum of Co 3O 4(110) single crystal surfaces by high resolution electron energy loss spectroscopy

Abstract

The Fuchs–Kliewer phonon spectrum of single crystal Co 3O 4(110) has been analyzed by high resolution electron energy loss spectroscopy (HREELS) and the four fundamental phonon losses have been identified at 26.8, 47.5, 71.1 and 84.7 meV (216, 383, 573 and 683 cm −1). This is the first HREELS study reported for an intrinsic spinel single-crystal surface with primary focus on the Fuchs–Kliewer phonon structure. The Co 3O 4 crystal is first characterized by Auger electron spectroscopy (AES), X-ray photoelectron spectroscopy (XPS) and low-energy electron diffraction (LEED), which establish the composition, cleanliness, and order of the (110) surface. Electron scattering is then used to obtain a series of well-resolved Fuchs–Kliewer phonon spectra over 2.25–14.25 eV incident electron energy range. The variation in phonon intensity with primary beam energy is shown to agree with that predicted by dielectric theory.