Fluorescence spectra of lanthanum monoiodide excited by the Ar+ 501.7-nm laser line have been observed and analyzed. Seven (sub)states are characterized. Preliminary rovibrational data are obtained for the four low-lying states (I-IV). The first two can be ascribed as X1Sigma and a3Delta: III does have Omega = 1, and IV is possibly 1Delta. The 11 laser-excited levels are tentatively grouped into three entities. Copyright 1998 Academic Press.

中文翻译：

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一碘化镧的电子态：来自高分辨率 LIF 光谱的初步数据

已经观察和分析了由 Ar+ 501.7-nm 激光线激发的单碘化镧的荧光光谱。表征了七个（子）状态。获得了四种低洼状态 (I-IV) 的初步振动数据。前两个可以归结为 X1Sigma 和 a3Delta：III 确实有 Omega = 1，而 IV 可能是 1Delta。11 个激光激发级暂时分为三个实体。版权所有 1998 学术出版社。