用可调谐激光两步激发Na原子高激发里德堡态布居,在光激发后施加脉冲电场测定激发态的场电离阈,利用阈值电场和延迟场电离方法测定了ns(n＝20～24)和nd(n＝19～23)态的寿命值,并与计算值进行了比较。对影响寿命的因素作了讨论。

We have obtained the population of the highly excited Rydberg states of sodium atom by two-step excitation using tunable lasers. The field- ionization thresholds for excitation states were measured by using a pulse electric field, which applied to interaction region after the laser excitation. Lifetimes for ns (n=20～24) and nd (n=19～23) states were measured by delaying field-ionization, and compared with the calculation values. The influence of some factors on lifetime is discussed.