采用铈钨材料作阴极比纯钨阴极灯的寿命要高得多。因为铈的逸出功比钨低得多,相应就降低了脉冲氙灯阴极发射点的温度。在氙灯放电过程中,阴极电子发射基本上是一个热过程,正离子流对阴极的轰击形成高温阴极斑点,成为电子的发射中心。灯内阴极表面由于和放电沟道中等离子体相接触而处于高温状态,阴极表面活性物质不断蒸发导致表面浓度下降,而阴极表面活性物质的浓度对电子发射是至关重要的。若活性物质浓度得不到及时补充,阴极发射性能势必下降。 The use of cerium tungsten cathode material than pure tungsten cathode lamp life is much higher. Since the work function of cerium is much lower than that of tungsten, the temperature of the cathode emission point of the pulsed xenon lamp is accordingly reduced. In xenon lamp discharge process, the cathode electron emission is basically a thermal process, positive ion current bombardment of the cathode to form a high temperature cathode spots, as the electron emission center. The cathode surface of the lamp is at a high temperature due to the contact with the plasma in the discharge channel, and the evaporation of the cathode surface active material results in a decrease of the surface concentration which is crucial for the electron emission. If the concentration of active substances can not be replenished in time, cathode emission performance is bound to decline.