Size dependence of L2,3 branching ratio and 2p core-hole screening in x-ray absorption of metal clusters.
Size dependence of L2,3 branching ratio and 2p core-hole screening in x-ray absorption of metal clusters.
复制标题
金属簇 X 射线吸收中 L2,3 分支比和 2p 核孔屏蔽的尺寸依赖性。
DOI：
10.1103/physrevlett.101.153401
复制
发表时间：
2008
影响因子：
8.6
通讯作者：
B. v Issendorff
中科院分区：
文献类型：
--
作者：
J. T. Lau;J. Rittmann;V. Zamudio;M. Vogel;K. Hirsch;P. Klar;F. Lofink;T. Möller;B. v Issendorff
本文报道了尺寸选择的过渡金属离子和1 ≤ n ≤ 200原子团簇的共振2 pX射线吸收谱。在L（2，3）边X射线吸收中，原子多重态分裂的残余可以分辨到三聚体，在三聚体以上的整体线形已经是块状的。发现钛、钒和钴簇的L（2，3）支化比与簇的尺寸有很强的相关性。虽然3d电子离域随团簇尺寸增加，但明显的2 p自旋轨道分裂在误差条内保持恒定。L（2，3）分支比的大小依赖性可以归因于3d/4s价电子对2 p-3d库仑相互作用的簇大小特异性屏蔽。
Resonant 2p x-ray absorption spectra of size-selected transition metal ions and clusters consisting of 1<or=n<or=200 atoms are reported. Remnants of atomic multiplet splitting in L(2,3)-edge x-ray absorption can be resolved up to the trimer, above which the overall line shape is already bulklike. A strong cluster size dependence of the L(2,3) branching ratio was found for titanium, vanadium, and cobalt clusters. While 3d electron delocalization increases with cluster size, the apparent 2p spin-orbit splitting remains constant within the error bars. The size dependence of the L(2,3) branching ratio can be attributed to cluster size specific screening of the 2p-3d Coulomb interaction by 3d/4s valence electrons.