The Residual Ionization in Nitrogen at High Pressures

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Abstract
The residual ionization in nitrogen at high pressures was measured under conditions existing during a recent investigation of the residual ionization in air, with lead and water shields. As in earlier investigations, the residual ionization in nitrogen was found to be greater than that in air at all pressures. However, at the new high pressures the ionization-pressure curve becomes parallel to the pressure axis, as do the air curves. The explanation in terms of subsidiary radiations excited by the cosmic penetrating radiation in the walls of the ionization chamber serves as well for nitrogen as for air. The new work is discussed in relation to earlier investigations of the residual ionization in air, oxygen, nitrogen and carbon dioxide.