【摘要】 <正>稀土元素铥（Tm）的基组态是4f¹³6s²,其f壳层未充满.s电子及f电子都有可能被激发,产生复杂的光谱性质.目前,有关Tm的能位的测量已做至高激发态,而寿命的测量还只限于低激发态.早在1969年,Handrich等人就采用能级交叉的方法测量了Tm的一些低激发态的寿命.三年后,Walle-nstein对Handrich的实验进行了改进,用同一方法重复了上面的测量.同时,P.Camus及Walle-nstein都对这些能级的寿命进行了理论计算.然而,更多还原

【Abstract】 The natural radidiative lifetime of some low-lying excited levels have been determined from measurements of time-resolved laser induced fluorescence in atomic beam. The levels were selectively populated by the light of a pulsed tunable dye laser pumped by an exeimer laser or a Nd:YAG laser.更多还原