1s2p resonant inelastic X-ray scattering combined dipole and quadrupole analysis method

Area of Science:

• Materials Science
• Condensed Matter Physics
• Spectroscopy

Background:

• X-ray absorption spectroscopy (XAS) and resonant inelastic X-ray scattering (RIXS) are powerful techniques for material characterization.
• Understanding the complementary information provided by XAS and RIXS is crucial for effective experimental design.

Purpose of the Study:

• To develop an analysis strategy for more effective use of RIXS compared to XAS.
• To determine the specific conditions under which RIXS provides information not obtainable through XAS.

Main Methods:

• Analysis of the RIXS plane using two theoretical models: an exciton model for quadrupole excitations and a continuum model for dipole excitations.
• Application of the developed approach to experimental 1s2p RIXS data from VO2 and TiO2.

Main Results:

• RIXS provides additional information compared to XAS exclusively when quadrupole excitations are present.
• The exciton model effectively describes quadrupole excitations, while the continuum model addresses dipole excitations.

Conclusions:

• RIXS is most valuable when quadrupole excitations are a significant factor in the material's electronic structure.
• Integrating this understanding with XAS dipole contribution calculations enables more efficient experimental planning and data interpretation.