Sr_2准分子吸收离化及混合跃迁的研究

A STUDY OF RESONACE IONIZATION SPECTRA AND HYBRID RESONACE TRANSITIONS OF Sr 2 EXCIMER

Ｎｄ－ＹＡＧ激光器三倍频泵浦的染料激光激发ＳｒＩ原子，热二极管探测共振离化信号，获得ＳｒＩ高Ｒｙｄｂｅｒｇ５ｓｎｄ１Ｄ２（ｎ＝１３－５１）系列双光子激光共振电离谱。实验发现激光波长调谐范围在４４０ｎｍ附近时，存在一Ｓｒ２准分子吸收光谱带，同时还观测到了５ｓ５ｐ１Ｐ１－５ｓ１１ｄ１Ｄ２，５ｓ５ｐ１Ｐ１－４ｄ２３Ｐ１混合共振跃迁现象。并对这种瞬态准分子的连续吸收光电离背景的形成和混合共振跃迁的机制作了初步探讨，同时对缓冲气体Ａｒ的气压和激光光强对混合共振跃迁的影响进行了分析与讨论。

Pumped by Nd-YAG dye lser, the ionization signals of strontium atoms are detected by thermionic diode and a series of spectra of high Rydberg 5snd 1D 2 states are obtained. The experiment finds, when laser wavelenghts are tuned close to 440nm, that there exists an excimer spectrum region and hybrid resonant transitions of 5s5p 1P 1-5s11d 1D 2 , and 5s5p 1P 1-4d 2 3P 1 . This work makes a preliminary discussion for the mechanism of an excimer continuum photo ionization background and hybird resonant transitions.