 
FIZIKA A 6 (1997) 4, 189194
MEASUREMENTS OF THE TRANSITION CURRENT FROM NORMAL TO ABNORMAL NEON
GLOW DISCHARGE
EMIL BARNA, VANIA COVLEA, COSTEL BILOIU and EMIL TOADER
The Bucharest University, Faculty of Physics, P.O.B. MG11, 76900
Bucharest  Magurele, Romania
Received 28 March 1997
Revised manuscript received 27 October 1997
A simple technique based on a nonlinear effect of selfexcited ionization waves is
used to measure the transition current I_{t} from normal glow discharge to an
abnormal glow discharge in neon. The experimental results are used further to calculate
the similarity parameter j_{n}/p^{2}, where j_{n} is the normal
current density and p is the neon gas pressure. The D.C. neon glow discharge is sustained
in a largediameter cylindrical glass tube (D = 10 cm) over the pressure range from 13 to
133 Pa (0.1 to 1.0 Torr). The results show that I_{t} has a quadratic dependence
on p, and the average value of the similarity parameter j_{n}/p^{2} is 453
pA/(cm^{2}Pa^{2}) (i.e. 8.05 mA/(cm^{2}Torr^{2})).
UDC 531.742
PACS number: 52.35Fp
