外电场中Yb原子高激发能级的辐射寿命

Radiative Lifetimes of the Highly─Excited Stark States of Ytterbium Atom In Electric Fields

采用“类氢”模型，用数值积分方法计算了不同外电场下Yb原子部分高激发Stark态的自发跃迁几率及环境黑体辐射引起的受激跃迁几率，并与采用延迟脉冲场电离方法对相应态的测量结果作了比较。讨论了环境黑体辐射引起的受激跃迁对周围能级的再布居特性，对“类氢”模型应用于复杂原子的适用性进行了分析．

The rates of blackbody radiation induced transitions and spontaneous transitions of Stark states of yttrerbium have been calculated by the method of numerical integration based on the hydrogenic model. The calculated results are compared with experimental data measured by using delayed electric field ionization. The distribution of repopulations among nearby states induced by environmental radiation is investigated and the availability of the hydrogenic model when applied to highly─excited states of complex atoms is discussed.