Optimal control RF pulses for excitation and suppression of NMR signals in a conductive medium

Boris Kharkov, Leonard Strouk, Thomas E. Skinner, Alexej Jerschow

Research output: Contribution to journalArticle

Abstract

In this work, optimal control theory was used to design efficient excitation schemes in highly conductive materials, where both the radio frequency field strength and phase vary as a function of penetration depth. A pulse was designed to achieve phase alignment between signals at different depths within the conductor and thus to obtain higher signals from that region. In addition, an efficient suppression pulse was designed by insuring mutual suppression between the signals from various depths in the sample. The performance of the new approach was demonstrated experimentally for a bulk lithium sample for the excitation problem and for a biphasic metal/liquid sample for the selective suppression pulse.

Original languageEnglish (US)
Article number034201
JournalJournal of Chemical Physics
Volume149
Issue number3
DOIs
StatePublished - Jul 21 2018

Fingerprint

Conductive materials
optimal control
Liquid metals
Control theory
Lithium
Nuclear magnetic resonance
retarding
nuclear magnetic resonance
pulses
excitation
control theory
liquid metals
field strength
radio frequencies
penetration
conductors
lithium
alignment

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

Cite this

Optimal control RF pulses for excitation and suppression of NMR signals in a conductive medium. / Kharkov, Boris; Strouk, Leonard; Skinner, Thomas E.; Jerschow, Alexej.

In: Journal of Chemical Physics, Vol. 149, No. 3, 034201, 21.07.2018.

Research output: Contribution to journalArticle

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