Ming Shen1, Rabia Roopchand2, Eugene S Mananga3, Jean-Paul Amoureux1, Qun Chen4, Gregory S Boutis5, Bingwen Hu6. 1. Physics Department & Shanghai Key Laboratory of Magnetic Resonance, East China Normal University, Shanghai 200062, China; UCCS, University Lille North of France, Villeneuve d׳Ascq 59652, France. 2. Department of Physics, Hunter College, New York, NY 10065, USA. 3. Center for Advanced Radiological Sciences, Division of Nuclear Medicine and Molecular Imaging Physics, Department of Radiology, Harvard Medical School and Massachusetts General Hospital, 55 Fruit Street, Boston, MA 02114, USA; Department of Physics and Technology, The City University of New York, 2155 University Avenue, CPH 118, Bronx, New York, NY 10453, USA. Electronic address: emananga@gc.cuny.edu. 4. Physics Department & Shanghai Key Laboratory of Magnetic Resonance, East China Normal University, Shanghai 200062, China. 5. Physics Department, Brooklyn College, 2900 Bedford Avenue, Brooklyn, NY 11210, USA. Electronic address: gboutis@brooklyn.cuny.edu. 6. Physics Department & Shanghai Key Laboratory of Magnetic Resonance, East China Normal University, Shanghai 200062, China. Electronic address: bwhu@phy.ecnu.edu.cn.
Abstract
Quadrupolar echo NMR spectroscopy of static solids often requires RF excitation that covers spectral widths exceeding 100 kHz, which is difficult to obtain due to instrumental limitations. In this work we revisit four well-known composite pulses (COM-I, II, III and IV) for broadband excitation in deuterium quadrupolar echo spectroscopy. These composite pulses are combined with several phase cycling schemes that were previously shown to decrease finite pulse width distortions in deuterium solid-echo experiments performed with two single pulses. The simulations and experiments show that COM-II and IV composite pulses combined with an 8-step phase cycling aid in achieving broadband excitation with limited pulse width distortions.
Quadrupolar echo NMR spectroscopy of static solids often requires RF excitation that covers spectral widths exceeding 100 kHz, which is difficult to obtain due to instrumental limitations. In this work we revisit four well-known composite pulses (COM-I, II, III and IV) for broadband excitation in pan class="Chemical">deuterium quadrupolar echo spectroscopy. These composite pulses are combined with several phase cycling schemes that were previously shown to decrease finite pulse width distortions in pan class="Chemical">deuterium solid-echo experiments performed with two single pulses. The simulations and experiments show that COM-II and IV composite pulses combined with an 8-step phase cycling aid in achieving broadband excitation with limited pulse width distortions.
Authors: Monica N Kinde-Carson; Crystal Ferguson; Nathan A Oyler; Gerard S Harbison; Gary A Meints Journal: J Phys Chem B Date: 2010-03-11 Impact factor: 2.991
Authors: Bernadeta Walaszek; Anna Adamczyk; Tal Pery; Xu Yeping; Torsten Gutmann; Nader de Sousa Amadeu; Stefan Ulrich; Hergen Breitzke; Hans Martin Vieth; Sylviane Sabo-Etienne; Bruno Chaudret; Hans-Heinrich Limbach; Gerd Buntkowsky Journal: J Am Chem Soc Date: 2008-12-24 Impact factor: 15.419
Authors: Ming Shen; Rabia Roopchand; Eugene S Mananga; Jean-Paul Amoureux; Qun Chen; Gregory S Boutis; Bingwen Hu Journal: Bo Pu Xue Za Zhi Date: 2015-06-05