Low Voltage Arcs in Iodine

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Abstract
Ionizing and radiating potentials in molecular and atomic iodine vapor.—Low voltage arcs in monatomic and molecular iodine vapor were investigated together with their spectra. From a study of the current-voltage curves it was concluded that 6.5 volts is the minimum radiating potential of the atom, 8.0 the ionizing potential of the atom, and 9.5 the ionizing potential of the molecule. Non-oscillating abnormal low voltage arcs were maintained down to 4.9 volts and oscillations were observed around 12 volts. With arc currents of about 2 amperes the filament current could be cut off and the arc sustained indefinitely at 30 volts or above.