【摘要】 概述了当前自由原子和离子的激发态自然辐射寿命测量技术的进展。以LaⅠ和PrⅡ为例,系统介绍了几种稀土元素自由原子和离子激发态寿命测量技术并分析了它们的优缺点;以SmⅡ为例,详细介绍了激光烧蚀产生自由原子(离子)技术及结合激光诱导荧光时间分辨光谱技术进行激发态寿命测量的优缺点。最后,探讨了改进上述技术局限性的解决思路,以期进一步提高辐射寿命测量的精确度。更多还原

【Abstract】 Advances in the techniques available for natural radiative lifetime measurement of excited states of free atoms and ions are presented. The disadvantages and advantages of several often-used methods for radiative lifetime measurements of free atoms and ions of rare-earth elements are reviewed by taking La Ⅰ and Pr Ⅱ as examples. Then,the techniques of the laser ablation to produce free atoms and ions are introduced by taking Sm Ⅱ as an example,and the time-resolved laser induced fluorescence( LIF) spectroscopy for the radiative lifetime measurements is discussed in detail. The limitation of this method of LIF combined with laser ablation is summarized and a possibly useful solution is suggested,which may be helpful to further improve the precision of radiative lifetime measurements.更多还原