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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 11, Iss. 4 — Apr. 1, 1972
  • pp: 899–906

Vacuum Ultraviolet Emission from High Density Spark Discharges in Argon and Helium

Lothar Michel and Heinz Fischer  »View Author Affiliations


Applied Optics, Vol. 11, Issue 4, pp. 899-906 (1972)
http://dx.doi.org/10.1364/AO.11.000899


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Abstract

The spectral radiant intensity (without imaging) is observed between 5000 Å and 1250 Å with gas pressures 1–8 atm in argon and 10–40 atm in helium. Tungsten and carbon electrodes with 1-mm gaps were used at breakdown voltages of 1.5–6.5 kV and C = 0.85 μF and L = 16.8 nHy. After reaching opacity and saturation within the visible range, the continuum radiation shifts toward shorter wavelengths with increasing voltage and gas pressure and reaches the intensity of the broad A+, A++, and He+ lines. Saturation of spectral intensity and self-reversal of lines is observed; intensities at 1250 Å may be higher by a factor of 25 than those at 5000 Å. Mean gas temperatures of approximately 60,000 K in argon and 100,000 K in helium are determined from the spectral lines of the electrode vapor in the case of relatively low gas pressures and foremost transparent channels by means of the Norm-temperature method. Channel pressures and particle densities are calculated from the channel expansion. Theoretical values of the continuum radiant intensity agree with the experimental results reasonably well.

© 1972 Optical Society of America

History
Original Manuscript: September 14, 1970
Published: April 1, 1972

Citation
Lothar Michel and Heinz Fischer, "Vacuum Ultraviolet Emission from High Density Spark Discharges in Argon and Helium," Appl. Opt. 11, 899-906 (1972)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-11-4-899

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