Numéro
J. Phys. Colloques
Volume 40, Numéro C7, Juillet 1979
XIVe Conférence Internationale sur les Phénomènes d'Ionisation dans les Gaz / XIVth International Conference on Phenomena in Ionized Gases
Page(s) C7-127 - C7-128
DOI http://dx.doi.org/10.1051/jphyscol:1979762
XIVe Conférence Internationale sur les Phénomènes d'Ionisation dans les Gaz / XIVth International Conference on Phenomena in Ionized Gases

J. Phys. Colloques 40 (1979) C7-127-C7-128

DOI: 10.1051/jphyscol:1979762

THE COMPOSITION OF THE POSITIVE COLUMN OF A HELIUM GLOW DISCHARGE AT INTERMEDIATE PRESSURES

F. Dothan et Yu. M. Kagan

Racah Institute of Physics, The Hebrew University of Jerusalem, Jerusalem Israel.


Abstract
The concentration of atomic and molecular ions and metastables is investigated for the positive column of a helium glow discharge. Recently (1,2) the system of differential equations for the helium afterglow describing the time change of these plasma parameters was written and solved. In the stationary positive column we can neglect some processes which are importent in the afterglow. On the other side we must take into account processes of excitation and ionization by electron collisions which can be neglected in the afterglow.