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Title: Controlling the dipole-dipole interaction using NMR composite rf pulses

New composite rf pulses are proposed during which the average dipole-dipole interactions within a spin ensemble are controlled, while a global rotation is achieved. The method used to tailor the pulses is based on the average Hamiltonian theory and relies on the geometrical properties of the spin-spin dipolar interaction. I describe several such composite pulses and analyze quantitatively the improvement brought on the control of the NMR dynamics. Numerical simulations show that the magic sandwich pulse sequence, during which the average dipolar field is effectively reversed, is plagued by defects originating from the finite initial and final π/2 rf pulses. A numerical test based on a classical description of nuclear magnetic resonance is used to check that, when these pulses are replaced by magic composite pulses, the efficiency of the magic sandwich is improved.
Authors:
 [1]
  1. Laboratoire Kastler Brossel, Ecole Normale Supérieure, CNRS, UPMC, 24 rue Lhomond, F75005 Paris (France)
Publication Date:
OSTI Identifier:
22419989
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Chemical Physics; Journal Volume: 141; Journal Issue: 5; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; COMPUTERIZED SIMULATION; CONTROL; DIPOLES; EFFICIENCY; HAMILTONIANS; INTERACTIONS; NUCLEAR MAGNETIC RESONANCE; PULSES; ROTATION; SPIN