Role of Quantum Coherence in Chirped Dynamic Nuclear Polarization

TL;DR

This paper investigates how quantum coherence influences the efficiency of chirped Dynamic Nuclear Polarization (DNP), revealing new insights into optimizing DNP techniques for enhanced NMR and MRI sensitivity.

Contribution

It provides a detailed theoretical analysis of quantum coherence effects during chirped DNP, including the role of decoherence, using density matrix formalism and fictitious product-operator bases.

Findings

Quantum coherence during DNP significantly affects polarization transfer efficiency.

Decoherence plays a crucial role in optimizing chirped DNP.

Insights applicable to low-temperature and triplet DNP using photoexcited electrons.

Abstract

Dynamic Nuclear Polarization (DNP) is transforming NMR and MRI by significantly enhancing sensitivity through the transfer of polarization from electron spins to nuclear spins via microwave irradiation. However, the use of monochromatic continuous-wave (CW) irradiation limits the efficiency of DNP for systems with heterogeneous broad EPR lines. Broad-band techniques such as chirp irradiation offer a solution, particularly for Solid Effect (SE) DNP in such cases. Despite its widespread use, the role of quantum coherence generated during chirp irradiation remains unclear, even though it is a key factor in determining the maximum achievable DNP efficiency. In this work, we use density matrix formalism to provide a comprehensive understanding of the quantum coherence generated during electron-nucleus double-quantum (DQ) and zero-quantum (ZQ) SE transitions and their impact on Integrated Solid Effect (ISE) DNP under chirp irradiation. Our analysis employs fictitious product-operator bases to trace the evolution of electron-nucleus coherence leading to integrated or differentiated SE. We also explore the previously unexamined role of decoherence in optimizing chirped DNP. These findings provide new insights into low-temperature DNP and triplet DNP using photoexcited electrons.