NAVAL ORDNANCE LAB WHITE OAK MD
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When a 270 kilobar shock wave emerges from an illuminated aluminum surface in a vacuum, blue light is emitted. This phenomenon is affected significantly by surface conditions. A chemically formed aluminum oxide surface layer on the metal luminesceses brightly for at least 0.64 microseconds. Normally oxidized aluminum surfaces luminesce less brightly for a much shorter time about 0.01 microseconds. The effect of non-oxidized material on the phenomenon is shown in that shocked gold does not luminesce. The luminescence from aluminum is attributed to electrons, dragged by the shock acoustoelectric effect. The electrons reach the aluminum oxide layer and, falling into the ionized F centers, emit blue light.
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- Inorganic Chemistry