基于激光共振电离质谱的钆奇宇称高激发态研究

钆同位素可作为生产医用同位素¹⁶¹Tb等的靶材，受限于高效光电离路径缺失等问题，目前仅能通过电磁方法生产，为实现钆的多步光电离，需要获取高激发态等光谱数据.基于国内自主研发的高分辨激光共振电离质谱，利用双色三步光电离方案，扫描了钆的36900～37700 cm^-1能区，首次获取了7条奇宇称高激发态能级，能级位置准确度可达±0.1 cm^-1,并根据角动量选择定则确定了可能的J值，同时发现了可用于质谱性能检验的单色光电离谱线.

The research on odd-parity high-lying energy levels of gadolinium based on resonance ionization mass spectroscopy

The gadolinium isotopes can be used as target material to produce the medical radioisotopes like 161Tb, and are produced only by electromagnetic separation method due to the lack of efficient photoionization path. The spectrum data such as high-lying energy level are needful for multistep photoionization of gadolinium. The scanning experiment, based on the homemade high-resolution resonance ionization mass spectroscopy, is conducted by the two-color three-step photoionization method for the 36900~37700 cm-1 energy region of gadolinium. 7 odd-parity high-lying energy levels are identified for the first time, and the accuracy is up to ±0.1 cm-1. The possible J-values of these levels are assigned based on the J-momentum selection rule. Meanwhile, one-color photoionization transitions are revealed, which can be used to test the performance of mass spectrometry.