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1·Nuclear effects produce hyperfine structure.

原子核的影响引起超精细结构。

2·It follows that two experiments of hyperfine structure of atomic energy level which are called magnetic resonamce experiment and co-line expression beam interative experiment.

介绍了研究原子能级超精细结构的两个实验：磁共振实验、共线快离子束相互作用实验。

3·The isotope shifts, hyperfine structure, spontaneous emission branch ratio of the first excited level and Doppler width of the atom vapor beam were measured using laser induced fluorescence.

采用原子蒸气束激光诱导荧光法测量钆原子的第一激发态的同位素位移及超精细结构、原子跃迁自发辐射的分支比和原子蒸气束的多普勒宽度。

4·This article is aimed at introducing the generation principle of fine structure and hyperfine structure of atomic energy level, with its experimental result improved, designed and illustrated.

介绍了原子能级的精细结构与超精细结构的产生原理，对研究原子能级精细结构的两个实验作了改进、设计及说明。