Accession Number : ADA188322

Title :   Study of the Vibrational Modes of Subsurface Oxygen on Al (111) Using Diode Laser Infrared Reflection-Absorption Spectroscopy.

Descriptive Note : Technical rept. no. 3, Oct 86-Sep 87,

Corporate Author : NAVAL RESEARCH LAB WASHINGTON DC

Personal Author(s) : Bermudez, V M ; Rubinovitz, R L ; Butler, J E

PDF Url : ADA188322

Report Date : 15 Oct 1987

Pagination or Media Count : 19

Abstract : Infrared reflection absorption spectroscopy (IRRAS), using polarization modulation and tunable diode laser excitation, has been applied to the study of the vibrational modes of subsurface oxygen on A1 (111). The dependence of the spectra on O2 exposure and on annealing has been investigated at a resolution of about 10-20/cm (1.2-2.5 meV) and correlated with Auger data. The absorption band (780-920/cm) consists of overlapping bands at about 835 and 862/cm associated, respectively, with isolated sites and with clusters of such sites resembling A1203. The apparent shift of this band to higher energy with increasing coverage, observed at lower resolution (but higher sensitivity) in electron energy loss spectroscopy, is found to result from the change in relative intensity of the two modes.

Descriptors :   *ALUMINUM, *EXCITATION, *OXIDES, *OXYGEN, *SPECTROMETERS, *TUNABLE LASERS, *VIBRATION, ABSORPTION SPECTRA, ANNEALING, AUGERS, BAND SPECTRA, ELECTRON ENERGY, ELECTRON SPECTROSCOPY, ENERGY BANDS, INFRARED SPECTROSCOPY, INTENSITY, LOSSES, LOW RESOLUTION, MODULATION, POLARIZATION, REFLECTION, REMOTE AREAS, SEMICONDUCTOR LASERS, SENSITIVITY, SHIFTING, SUBSURFACE

Subject Categories : Inorganic Chemistry
      Physical Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE