Ein neuer dunkelraum in der nähe einer glühkathode in einer bogenentladung
1937; Elsevier BV; Volume: 4; Issue: 1 Linguagem: Inglês
10.1016/s0031-8914(37)80095-6
ISSN1873-1767
AutoresM.J. Druyvesteyn, N. Warmoltz,
Tópico(s)High voltage insulation and dielectric phenomena
ResumoA new dark space round the oxide coated cathode of an arc in noble gases and mercury vapour is described whose dark space occurs at a current density higher than 0,1 Amp/cm2 and a pressure between 10-2 mm and 3 mm. The thickness of this dark sheath is about 20 times that of the space charge sheath at the cathode. At lower pressure the new dark sheath disappears and a bright sheath of the same dimensions is seen. Coming from the cathode, a sharp increase of the concentration and a decrease of the mean energy of the fast electrons is observed at the limit of the sheath ; with the aid of these electrical results the optical phenomena can be explained. The electrical behaviour can be explained by the scattering of the group of fast electrons which starts at the boundary of the space charge layer on the cathode ; this scattering increases with increasing arc current.
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