arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0912.0792cond-mat.mtrl-sci
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振动对X射线吸收谱前沿特征的影响

Effect of vibrations on the pre-edge features of x-ray absorption spectra

Christian Brouder, Delphine Cabaret, Amélie Juhin, Philippe Sainctavit

摘要:

假定原子振动能量相对于仪器分辨率较小,计算了原子振动对X射线吸收近边结构(XANES)的影响。由此产生的表达式表明,在K边,振动使电偶极跃迁到3s和3d的最终状态。将理论应用于Al_2O_3金红石中Al的K边和TiO_2金红石中Ti的K边,并与实验进行了比较。在铝K-边缘,相当大的过渡到3s的最终状态,导致与实验光谱的协议有明显的改善。在Ti K-边缘,向3D最终状态的电偶极跃迁解释了边缘前特征的温度依赖性。

英文摘要:

The influence of atomic vibrations on x-ray absorption near edge structure (XANES) is calculated by assuming that vibrational energies are small with respect to the instrumental resolution. The resulting expression shows that, at the K-edge, vibrations enable electric dipole transitions to 3s and 3d final states. The theory is applied to the K-edge of Al in Al2O3 corundum and of Ti in TiO2 rutile and compared with experiment. At the Al K-edge, sizeable transitions towards 3s final states are obtained, leading to a clear improvement of the agreement with experimental spectra. At the Ti K-edge, electric dipole transitions towards 3d final states explain the temperature dependence of the pre-edge features.

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