Optogalvanic Measurement of the Cathode-Fall Region of Kr Hollow Cathode Discharge

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Optogalvanic observation of the Stark shift of the Kr 8d[3/2]2 0-5p[3/2]2 atomic line has been carried out on a Kr hollow cathode discharge in a discharge tube with a cylindrical cathode, at a fill pressure of 1 to 6 Torr (1 Torr = 133.322 Pa), and a discharge current from 1 to 10 mA, to reveal the linear decrease of electric field with radial distance from the cathode surface. Values of current density, charge density, and other discharge parameters have been derived and their behavior has been compared with theoretical formula; it is concluded that a major role is played by the photons from the negative-glow region. Unusual features observed in the discharge at 1 Torr pressure and above 5 mA of current have been attributed to the effect of Penning ionization of sputtered copper atoms.

Keywords: Hollow cathode discharge of Kr; Laser optogalvanic spectroscopy; Optogalvanic measurement of discharge; Stark effect in the cathode-fall region

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/0003702874448490

Affiliations: Research Laboratory of Resources Utilization, Tokyo Institute of Technology, 4259 Nagatsuta Midori-ku, Yokohama, 227 Japan

Publication date: May 1, 1987

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