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Proceedings Paper

Improved rf plasma jet generation of singlet delta oxygen
Author(s): Josef Schmiedberger; Sanyo Takahashi; Hiroo Fujii
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Paper Abstract

Rf oxygen plasma jets were studied experimentally as an alternative source of molecular singlet delta oxygen for an oxygen-iodine laser. The relative yield of singlet delta oxygen was measured under a wide variety of experimental conditions. The rf frequency range was 27.2 - 99.9 MHz and the rf power was up to 200 W. The oxygen output pressure was 0.05 - 0.40 torr and the oxygen flow rate was 195 - 1000 sccm. High purity oxygen or its mixtures with Ar, N2, NO and Hg at the pumping velocity of 250 m3/h were used. The plasma jet was produced in nozzles, having the inner diameter of 1 - 6 mm and the length of 1 - 16 mm. The nozzle materials Al, Ti, Ta and W gave significantly better results than Pt and Ni. The dependence of singlet delta oxygen production on the radiofrequency was increasing monotonously. Other dependencies were not monotonous and exhibited an optimum. The cw mode of operation gave usually better results than a pulsed mode. The most effective admixture was N2, which gave the highest enhancement. This resulted in the relative yield of singlet delta oxygen exceeding 15%.

Paper Details

Date Published: 4 April 1997
PDF: 4 pages
Proc. SPIE 3092, XI International Symposium on Gas Flow and Chemical Lasers and High-Power Laser Conference, (4 April 1997); doi: 10.1117/12.270166
Show Author Affiliations
Josef Schmiedberger, Institute of Physics (Czech Republic)
Sanyo Takahashi, Mechanical Engineering Lab. (Japan)
Hiroo Fujii, Kawasaki Heavy Industries, Ltd. (Japan)

Published in SPIE Proceedings Vol. 3092:
XI International Symposium on Gas Flow and Chemical Lasers and High-Power Laser Conference
Denis R. Hall; Howard J. Baker, Editor(s)

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