Adiabatic cross-polarization via intermediate dipolar-ordered state

TL;DR

This paper demonstrates an adiabatic cross-polarization method that enhances the polarization of rare nuclei by converting Zeeman order into dipolar order and back, outperforming traditional techniques.

Contribution

It introduces a novel adiabatic scheme for cross-polarization that improves polarization transfer efficiency between nuclei.

Findings

Significant increase in rare nuclei polarization using the adiabatic scheme

Effective conversion between Zeeman and dipolar orders demonstrated

Potential for improved NMR sensitivity in experiments

Abstract

It is experimentally demonstrated that an adiabatic demagnetization - remagnetization scheme, where the Zeeman order of abundant nuclei is first adiabatically converted into the dipolar order, and then, into the Zeeman order of rare nuclei, can significantly increase polarization of rare nuclei compared to the conventional cross-polarization technique.