Enhanced Tensor Polarization in Solid-State Targets

TL;DR

This paper demonstrates enhanced tensor polarization in solid-state targets through RF techniques, improving the alignment of spins and the effectiveness of high-energy scattering experiments.

Contribution

It introduces a novel RF-based method for increasing tensor polarization in solid targets, surpassing previous polarization levels in scattering experiments.

Findings

Achieved higher tensor polarization than previous methods

Demonstrated effectiveness of RF semi-saturation techniques

Improved figure of merit for scattering experiments

Abstract

We report measurements of enhanced tensor polarization on solid-state targets. The results here represent an increase in tensor polarization over that previously achieved in high energy and nuclear scattering experiments that focused on the measurement of tensor polarized observables. Enhancement techniques are used which require RF produced close to the Larmor frequency of the target spins and use selective semi-saturation resulting from two sources of irradiation, microwave for the DNP process and the additional RF used to manipulate the population of the energy levels in the target material. The spin dynamics of the solid target are used to align the spins enhancing the ensemble average to improve the figure of merit of the scattering experiment. Target rotation at an optimized rate can lead to additional enhancement by applying selective semi-saturation in polycrystalline materials that possess a Pake doublet in their NMR signal.