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Spacially and temporally resolved spectra are described from explosions of Al foil strips in Ar at 100 and 700 Torr. Spectra were obtained photographically with a time resolution of 0.3 μs using a rotating mirror streaking camera. Measurements were made at 1, 2, 5, 10 and 15 mm above
the foil surface with a spacial resolution of 0.1 mm. The early appearance of Ar ion lines for explosions in Ar at 100 Torr implies initial current conduction following foil vaporization via dielectric breakdown of the Ar. At 700 Torr, the complete absence of radiation from Ar ion lines suggests
that gas-phase current conduction begins by dielectric breakdown of the metal vapor. The short duration of Ar ion radiation in any observation zone at 100 Torr coupled with the first appearance of radiation from metallic species during the period of decaying Ar intensity implies that the metal
vapor is collisionally excited and ionized as it passes through the Ar current sheath. From the results of these studies, a dual channel, photoelectric, gated integration procedure was used to obtain greater analysis line/background ratios. A two- to four- fold increase in line/background
ratios is obtained when radiation from 15 mm above the foil is integrated during the interval from 25 to 125 μs after foil vaporization.
Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109
Publication date: May 1, 1979
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The Society publishes the internationally recognized, peer reviewed journal, Applied Spectroscopy, which is available both in print and online. Subscriptions are included with membership or can be purchased by institutional or corporate organizations. Abstracts may be viewed free of charge. Previously published as Bulletin (Society for Applied Spectroscopy)