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中文摘要：
本文采用三台染料激光器分步激发Ba原子,利用自电离过程产生离子或电子.当固定第一和第三步激光波长而扫描第二步激光波长时,便可获得Ba原子6sns Rydberg态的光谱.当固定第一和第二步激光波长而扫描第三束激光波长时,便可获得Ba原子6pns自电离态的光谱.运用多通道量子亏损理论对实验光谱进行了分析,着重针对主量子数n≤10的6pns自电离态的光谱检验了所用理论模型的准确性,取得了满意的结果.
英文摘要：
Three dye lasers are used to excited Ba atoms to obtain ions and electrons through autoionization process. The wavelength of the second laser is scanned when those of the first and third lasers are fixed, through which spectra of Ba 6sns Rydberg series are measured. The wavelength of the third laser is scanned when those of the first and second lasers are fixed, through which spectra of Ba 6pns autoionization series are measured. Experimental spectra are described and analyzed by multichannel quantum defect theory. The Ba Rydberg state and 6pns（ n = 8- 10） have been discussed in this paper. Agreement between the theory and experiment is achieved.
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