STUDIES OF COPPER VALENCE STATES WITH CU L3 X-RAY-ABSORPTION SPECTROSCOPY
STUDIES OF COPPER VALENCE STATES WITH CU L3 X-RAY-ABSORPTION SPECTROSCOPY
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DOI：
10.1103/physrevb.39.1541
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发表时间：
1989-01-15
影响因子：
3.7
通讯作者：
KARNATAK, RC
中科院分区：
文献类型：
--
作者：
GRIONI, M;GOEDKOOP, JB;KARNATAK, RC
我们已经使用X射线吸收光谱研究了一系列化合物，其中铜假定在0和3之间的形式价。我们发现Cu原子的化学状态对Cu L3吸收边的形状、阈值能量和强度有很大的影响。我们使用大量的铜化合物，包括硫化物，氧化物，La-Sr-Cu-O化合物，酞菁配合物，和各种矿物的Cu 2 p X射线吸收光谱表明，存在一个强大的2 p-3d激子跃迁是一个指纹的Cu（d 9）贡献的基态。简单的离子图像一般不足以描述这些化合物。
We have used x-ray-absorption spectroscopy to study a series of compounds in which Cu assumes a formal valence between 0 and 3. We find that the shape, the threshold energy, and the intensity of the Cu L 3 absorption edge is strongly influenced by the chemical state of the Cu atoms. We use the Cu 2p x-ray-absorption spectra of a large number of Cu compounds, including sulfides, oxides, La-Sr-Cu-O compounds, a phthalocyanine complex, and various minerals to show that the presence of a strong 2p-3d excitonic transition is a fingerprint of the Cu (d 9) contribution to the ground state. A simple ionic picture is generally inadequate to describe these compounds.