Controlling effective Hamiltonians: Broadband pulsed dynamic nuclear polarization by constrained random walk and...

Area of Science:

• Magnetic Resonance Spectroscopy
• Quantum Control
• Physical Chemistry

Background:

• Designing magnetic resonance experiments requires precise control over Hamiltonians.
• Broadband polarization transfer is crucial for enhancing sensitivity in various NMR applications.
• Existing methods may lack efficiency or systematic design capabilities.

Purpose of the Study:

• To present novel optimization procedures for magnetic resonance experiment design.
• To enable systematic design and fundamental understanding of experiments.
• To achieve efficient broadband polarization transfer using effective Hamiltonians.

Main Methods:

• Constrained random walk (cRW) for experiment design.
• Figure of Merit (FOM) based non-linear optimization.
• Utilizing exact effective Hamiltonian theory for linear and bilinear terms.

Main Results:

• Demonstrated efficacy of combined cRW and FOM optimization.
• Successfully designed broadband dynamic nuclear polarization (DNP) pulse sequences.
• Achieved electron spin excitation bandwidths up to 100 MHz in static solids.

Conclusions:

• The cRW and FOM-based approach offers a powerful tool for magnetic resonance experiment design.
• This method facilitates efficient control over experimental parameters for broadband applications.
• The developed techniques advance the field of DNP spectroscopy for solid-state materials.