1m>sm>2m>pm> resonant inelastic X-ray scattering combined dipole and quadrupole analysis method

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• 作者：Alexander Bagger ; Ties Haarman ; Anna Puig Molina ; Poul George Moses ; Hirofumi Ishii ; Nozomu Hiraoka ; Yu-Han Wu ; Ku-Ding Tsuei ; Ib Chorkendorff and Frank De Groot
• 关键词：resonant inelestic X-ray scattering ; RIXS ; X-ray absorption ; X-ray emission
• 刊名：Journal of Synchrotron Radiation
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：24
• 期：1
• 页码：296-301
• 全文大小：894K
• ISSN：1600-5775

文摘

In this study an analysis strategy towards using the resonant inelastic X-ray scattering (RIXS) technique more effectively compared with X-ray absorption spectroscopy (XAS) is presented. In particular, the question of when RIXS brings extra information compared with XAS is addressed. To answer this question the RIXS plane is analysed using two models: (i) an exciton model and (ii) a continuum model. The continuum model describes the dipole pre-edge excitations while the exciton model describes the quadrupole excitations. Applying our approach to the experimental 1m>sm>2m>pm> RIXS planes of VO₂ and TiO₂, it is shown that only in the case of quadrupole excitations being present is additional information gained by RIXS compared with XAS. Combining this knowledge with methods to calculate the dipole contribution in XAS measurements gives scientists the opportunity to plan more effective experiments.