The results showed that breakdown in xenon leading to the low-voltage a r c can occur at voltages even lower than the f i r s t excitation potential of xenon. No minimum spacing effect was observed, the low voltage a r c occurred for interelectrode spacings down to 0.05 centimeter. At a spacing of 0.05 centimeter and a cathode temperature of 1 7 0 0~ C, the low-voltage xenon a r c could be induced over the p r e s s u r e range of 1 to 500 t o r r (133 t o 6.6 7 x 1 0~ N/m2). Under some conditions of p r e s s u r e and spacing the low -voltage xenon a r c could be sustained at voltages as low as 1 t o 2 volts.