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- W1497343578 abstract "Spectroscopic studies of the UV emission from surface-discharge sparks across Al/sub 2/O/sub 3/, BN, ZnO, ZrO/sub 2/, BaTiO/sub 3/, ZnO.Al/sub 2/O/sub 3/, and Cr/sub 2/O/sub 3/.Al/sub 2/O/sub 3/ substrates have been performed in He, N/sub 2/, CO/sub 2/, Ar, SF/sub 6/, and Ar + i-C/sub 3/F/sub 7/I gases at pressures of 1 to 10 atm. Considerable differences were found in the performance of the various substrates; the best result obtained was with a 2-cm gap Cr/sub 2/O/sub 3/.Al/sub 2/O/sub 3/ substrate which gave 6.20 +- 0.78 J of UV radiated in the 2500 to 2900-A iodine-laser pumpband for a stored electrical energy of 66.2 J and circuit parameters C = 82.8 nF and V/L approximately equal to 9.1 x 10/sup 10/ Volts/Henry. Neglecting circuit losses and reciprocity failure of the spectroscopic plates, this gives 9.4 +- 1.1 percent efficiency. Enhancement of the UV output was again noted with the addition of small concentrations of i-C/sub 3/F/sub 7/I to Ar at high pressures. The best result for UV energy density is 2.5 J/cm/sup 2/ for the same substrate. The degree of channel spreading across the surface is a function of the ease of substrate vaporization, and source performance is not relatedmore » to the UV diffuse reflectivity of the ceramic substrate since surface metallization occurs during the discharge. Additional improvements can be realized with long-path discharges driven by a Marx bank.« less" @default.
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- W1497343578 date "1976-10-29" @default.
- W1497343578 modified "2023-09-27" @default.
- W1497343578 title "Surface discharge UV arc sources for laser excitation. Final report" @default.
- W1497343578 hasPublicationYear "1976" @default.
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