Assessment of oxygen in gallium arsenide by infrared local vibrational mode spectroscopy.

Two infrared local vibration mode (LVM) absorption lines occurring at 715 and 845 cm high minus 1 shift to 679 and 802 cm high minus 1 in gallium arsenide doped with high 18 O, proving that the lines arise from the vibrations of oxygen impurities. The 715 cm high minus 1 line exhibits a triplet high 69,71 Ga isotope fine structure consistent with that expected from a quasi-subsitutional V sub As-O center. The 845 cm high minus 1 line appears as a closely spaced doublet expected for a bonded interstitial oxygen atom.