Abstract
Amorphous boron-hydrogen alloys (9 to 24 at % H) have been prepared and optical properties determined. In the ir, the only bands observed involving H are the B-H stretch at 2560 cm −1 and the B-H bend at 1108 cm −1; no evidence is found for bands associated with BH 2 groupings or H three-center bonds. In the visible-near uv, the ϵ 2 spectrum for the sample with 9 at % H has a broad maximum near 5eV with a peak value of 6. With increasing H content, both optical gap and ϵ 2 peak move to higher energies, while the ϵ 2 peak value and refractive index decrease.
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