Magnetic linear response properties calculations with the Gaussian and augmented-plane-wave method

Area of Science:

• Computational Chemistry
• Quantum Mechanics
• Spectroscopy

Background:

• Accurate prediction of NMR chemical shifts and EPR g tensors is crucial for understanding molecular structure and dynamics.
• Existing methods may have limitations in accuracy or applicability for all-electron systems.

Purpose of the Study:

• To develop and validate a novel all-electron calculation method for NMR chemical shifts and EPR g tensors.
• To demonstrate the method's utility through exemplary applications.

Main Methods:

• Utilized the Gaussian and augmented-plane-wave (GAPW) method.
• Employed generalized density functional perturbation theory (GDFPT).
• Validated against established theoretical methods for small molecules.

Main Results:

• Successfully implemented an all-electron calculation approach for NMR and EPR parameters.
• Demonstrated accuracy through comparison with existing theoretical techniques.
• Applied the method to complex systems like hydrated adenine and defects in alpha-quartz.

Conclusions:

• The developed GDFPT-based GAPW method provides a robust tool for calculating NMR chemical shifts and EPR g tensors.
• The method shows promise for accurate predictions in both small molecules and complex material systems.
• Quantum mechanical/molecular mechanical (QM/MM) approaches can be effectively integrated for studying larger systems.