Derbez G, Petrakian J P
Appl Opt. 1974 Mar 1;13(3):599-601. doi: 10.1364/AO.13.000599.
Under static ultrahigh vacuum (10(-9) torr), we have studied the optical properties of lanthanum and praseodymium thin films. It is shown that these films behave similarly in the 2000-8000 A spectral range. Results are identical for other light rare-earth thin films. We suggest that indirect transitions are responsible for the presence of a maximum in the optical absorption near 5,8 eV.
在静态超高真空（10⁻⁹ 托）条件下，我们研究了镧和镨薄膜的光学性质。结果表明，这些薄膜在2000 - 8000埃光谱范围内表现相似。其他轻稀土薄膜的结果也是相同的。我们认为，间接跃迁是导致在5.8电子伏特附近的光吸收出现最大值的原因。
