Pulsed spin-locking of spin-3/2 nuclei: 39K-NQR of potassium chlorate

Kyle Edward Nixon; Karen L Sauer

doi:10.1016/j.jmr.2022.107145

Pulsed spin-locking of spin-3/2 nuclei: ³⁹K-NQR of potassium chlorate

J Magn Reson. 2022 Feb:335:107145. doi: 10.1016/j.jmr.2022.107145. Epub 2022 Jan 15.

Authors

Kyle Edward Nixon¹, Karen L Sauer²

Affiliations

¹ George Mason University, 4400 University Drive, Fairfax, VA 22030, United States. Electronic address: knixon4@gmu.edu.
² George Mason University, 4400 University Drive, Fairfax, VA 22030, United States. Electronic address: ksauer1@gmu.edu.

PMID: 35078010
DOI: 10.1016/j.jmr.2022.107145

Abstract

A model was developed for predicting a locked signal under a series of refocusing pulses for Nuclear Quadrupole Resonance (NQR) of spin I=32 and tested with a powder of KClO₃. This work represents the first direct NQR detection of the ³⁹K line of potassium chlorate. The characteristic time constants, T₁,T_2e and T₂^∗, were measured to determine the detectability of potassium chlorate via ³⁹K-NQR. The echo train T_2e was found to be strongly dependent on the refocusing pulse-spacing and weakly dependent on the refocusing pulse strength. The optimal angles of the excitation and echo pulse for a pulse train were also determined, as well as, the resonance-frequency dependence on sample temperature.

Keywords: Half-integer quadrupoles; Nuclear quadrupole resonance; Potassium chlorate; Powder sample; Pulse sequences; Quadrupolar nuclei; Spin-3/2; Spin-echo decay; Spin-lattice relaxation time; Zero-field NMR.

Publication types

Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

Algorithms*
Chlorates
Magnetic Resonance Spectroscopy

Substances

Chlorates
chloric acid