Towards high-resolution X-ray scattering as a probe of electron correlation

Area of Science:

• Computational Chemistry
• Quantum Mechanics
• Materials Science

Background:

• X-ray scattering is a powerful technique for probing material structures.
• Accurate theoretical calculations are crucial for interpreting experimental scattering data.
• Electron correlation significantly influences molecular properties and interactions.

Purpose of the Study:

• To investigate the impact of electron correlation on X-ray scattering cross sections.
• To assess the accuracy of various quantum chemical methods in predicting scattering.
• To explore X-ray scattering as a sensitive probe for electron correlation.

Main Methods:

• Calculated X-ray scattering cross sections using Hartree-Fock (HF), CASSCF, MCCI, and FCI methods.
• Analyzed scattering behavior for Ne, CO, and O3 molecules.
• Examined the convergence of elastic, inelastic, and total scattering components.

Main Results:

• More correlated wavefunctions yielded significantly more accurate total scattering for Ne.
• Total scattering signal in CO correlated with multireference character.
• Inelastic and total scattering components of O3 were most sensitive to correlation strength.

Conclusions:

• Electron correlation strongly affects X-ray scattering cross sections.
• Advanced quantum chemical methods are necessary for accurate scattering predictions.
• Precise X-ray scattering measurements can serve as a sensitive probe of electron pair-wise correlation.