Adiabatic Fast Passage Spin Manipulation Measurements in Solid Polarized Targets
Abstract
Adiabatic fast passage (AFP) is a rapid method for reversing nuclear polarization and manipulating spin populations in polarized solid targets, avoiding the long repolarization times associated with dynamic nuclear polarization (DNP). We report AFP measurements in a 5~T, 1~K polarized-target system for irradiated NH, irradiated ND, and butanol-based materials prepared either with TEMPO doping or by irradiation. We also present a joint manipulated-lineshape analysis for spin-1 targets and demonstrate that vector and tensor polarizations can be extracted from AFP-manipulated deuteron NMR spectra even when the populations are not described by a single Boltzmann spin temperature. Finally, we report a reproducible polarization- and direction-dependent AFP response in a large irradiated NH sample. These ammonia results are presented as empirical observations under the specific sample-coil conditions of the experiment, with possible circuit-mediated mechanisms such as radiation damping or superradiant behavior discussed but not assigned as a definitive cause.
Cite
@article{arxiv.2604.02365,
title = {Adiabatic Fast Passage Spin Manipulation Measurements in Solid Polarized Targets},
author = {M. F. Hossain and K. Nakano and N. G. Vismith and D. Keller},
journal= {arXiv preprint arXiv:2604.02365},
year = {2026}
}
Comments
Submitted to Nuclear Instruments and Methods in Physics Research Section A