The objective of this paper is to propose mechanisms of gas desorption induced discharge and their polarity effect. Three electrode pair types were combined in the in-situ experimental apparatus with high vacuum; air-exposed cathode and anode, airexposed cathode and conditioned anode, conditioned cathode and air-exposed anode. Electrode pairs were subjected to repetitive impulse voltage breakdowns till conditioning saturation. The results showed two gas desorption induced discharge mechanisms; namely, pulsed current discharge (PCD) and pulsed current induced breakdown (PB). Many gas desorption induced discharge (PCD and PB) occurred in air-exposed cathode and anode pair and air-exposed cathode and conditioned anode pairs. While only a few discharges occurred in the conditioned cathode and air-exposed anode pair. The gas desorption induced discharge in vacuum showed a polarity effect; Only when the cathode electrode of the pair was the original air-exposed electrode, no matter the anode electrode was or not, gas desorption induced discharge (PCD and PB) could occur in the beginning stage of the conditioning. The physical evolution of gas desorption induced discharge is explained.

中文翻译：

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真空中气体解吸诱导放电及其极性效应

本文的目的是提出气体解吸诱导放电的机制及其极性效应。三种电极对组合在高真空原位实验装置中；空气暴露阴极和阳极，空气暴露阴极和调节阳极，调节阴极和空气暴露阳极。电极对经受重复的脉冲电压击穿直到调节饱和。结果显示了两种气体解吸诱导放电机制；即脉冲电流放电（PCD）和脉冲电流感应击穿（PB）。许多气体解吸诱导放电（PCD 和 PB）发生在暴露于空气的阴极和阳极对以及暴露于空气的阴极和经过调节的阳极对中。而在经过调节的阴极和暴露于空气的阳极对中只发生了少量放电。真空中气体解吸诱导放电表现出极性效应；只有当该对的阴极电极是原来的空气暴露电极时，无论阳极电极是否存在，在调节的开始阶段都会发生气体解吸诱导放电（PCD和PB）。解释了气体解吸诱导放电的物理演变。