Abstract
The growth of pre-breakdown ionization currents
I
in uniform fields in nitrogen has been measured over a range of the spark parameters
E/p
from 41 to 45 V/cm/mm Hg and
pd
up to 810 mm Hg cm with sparking potentials up to 38 kV, where
p
is the gas pressure and
d
the electrode separation. The graphs of log
I
against
d
were initially linear, but at separations near the sparking distance the graphs curved upwards, indicating the existence of both primary
α
and secondary (
ω/α
) ionization mechanisms. The sparking potentials and distance here measured were found to be exactly in accordance with those predicted by the growth of current equation
I
=
I
0
exp (
αd
)/[1 – (
ω/α
) {exp(
αd
) –1 }]. There were strong indications that the secondary ionization was, in fact, a cathode process. Possible effects of space charge were also considered, and the spark mechanism discussed.
Reference7 articles.
1. Proc. Roy;Llewellyn Jones F.;Soc. A,1952
2. Failure of Paschen's Law and Spark Mechanism at High Pressure
3. Nature;Llewellyn Jones F.;Lond.,1951
4. Loeb L. B. & Meek J. M. 1941 The mechanism of the electric spark p. 38. Stanford: The University Press.
5. Arch;Masch K.;Elektrotech.,1932
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