【摘要】 本文报导用TEA选频CO₂激光器研究CO₂放电气体的瞬态光电流效应。实验观测到光电流信号随时间变化的函数图象;探讨了这种效应的机理,得到了光电流的解析表达式。在小电流的放电条件下,激光辐照后振动弛豫引起局部的气体温度改变,是光电流效应的主要原因;电子与分子碰撞的平均能量转移系数的改变,是光电流放应的次要原因,但是不能忽略;放电电流小于0.5mA的条件下,要考虑负离子存在所引起的效应。更多还原

【Abstract】 Reported here is the investigation of transient optogalvanic effect of the CO₂ discharge irradiated with a TEA CO₂ laser. The optogalvanic signals as a function of time have been observed. The mechanisms of the effect are discussed and analytical expressions are obtained. At low discharge currents, the local gas temperature change caused by the vibrational relaxation after the irradiation of a laser pulse is the main cause of the laser-induced optogalvanic effect, and a change in the mean energy exchange per electron-molecule collision is the secondary cause. It is necessary to consider the effect of negative ions when the discharge current is less than 0.5mA.更多还原