Abstract

The photoelectric steady-state currents JL in liquid Ar, liquid CH4 and liquid N2 were measured, changing the level of injection current. The current level was varied over a wide range using ultra violet light from a deuterium lamp. In liquid Ar and liquid CH4, when the current in vacuum Jv (which is defined as an injection current) was less than 0.1 nA cm-2. JL was proportional to the external field E0 at low fields, while at high fields JL was proportional to E01/2. However, by increasing JV at low fields a space-charge-limited JL was observed, with the linear relation between JL and E01/2 being unchanged at high fields. On the basis of measured curves of JL against E0, the distributions of space charge, field strength, and currents of electron and negative ion components within the gap were simulated. The space charge was presumed to appear due to accumulation of negative ions produced through attachment of electrons to oxygen impurities which might be included originally in gas samples. In liquid N2, JL was proportional to E01.8-2, although it increased proportionally with JV.

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