[NMR paper] Significance of symmetry in the nuclear spin Hamiltonian for efficient heteronuclear dipolar decoupling in solid-state NMR: A Floquet description of supercycled rCW schemes.
Significance of symmetry in the nuclear spin Hamiltonian for efficient heteronuclear dipolar decoupling in solid-state NMR: A Floquet description of supercycled rCW schemes.
Related ArticlesSignificance of symmetry in the nuclear spin Hamiltonian for efficient heteronuclear dipolar decoupling in solid-state NMR: A Floquet description of supercycled rCW schemes.
J Chem Phys. 2017 Mar 14;146(10):104202
Authors: Equbal A, Shankar R, Leskes M, Vega S, Nielsen NC, Madhu PK
Abstract
Symmetry plays an important role in the retention or annihilation of a desired interaction Hamiltonian in NMR experiments. Here, we explore the role of symmetry in the radio-frequency interaction frame Hamiltonian of the refocused-continuous-wave (rCW) pulse scheme that leads to efficient (1)H heteronuclear decoupling in solid-state NMR. It is demonstrated that anti-periodic symmetry of single-spin operators (Ix, Iy, Iz) in the interaction frame can lead to complete annihilation of the (1)H-(1)H homonuclear dipolar coupling effects that induce line broadening in solid-state NMR experiments. This symmetry also plays a critical role in cancelling or minimizing the effect of (1)H chemical-shift anisotropy in the effective Hamiltonian. An analytical description based on Floquet theory is presented here along with experimental evidences to understand the decoupling efficiency of supercycled (concatenated) rCW scheme.
Five Decades of Homonuclear Dipolar Decoupling in Solid-State NMR: Status and Outlook
Five Decades of Homonuclear Dipolar Decoupling in Solid-State NMR: Status and Outlook
Publication date: Available online 4 August 2016
Source:Progress in Nuclear Magnetic Resonance Spectroscopy</br>
Author(s): Kaustubh R. Mote, Vipin Agarwal, P.K. Madhu</br>
It has been slightly more than fifty years since the first homonuclear spin decoupling scheme, Lee-Goldburg decoupling, was proposed for removing homonuclear dipolar interactions in solid-state nuclear magnetic resonance. A family of such schemes has made observation of high-resolution NMR spectra of...
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08-05-2016 12:26 PM
[NMR paper] Relative merits of rCW(A) and XiX heteronuclear spin decoupling in solid-state magic-angle-spinning NMR spectroscopy: A bimodal Floquet analysis.
Relative merits of rCW(A) and XiX heteronuclear spin decoupling in solid-state magic-angle-spinning NMR spectroscopy: A bimodal Floquet analysis.
Relative merits of rCW(A) and XiX heteronuclear spin decoupling in solid-state magic-angle-spinning NMR spectroscopy: A bimodal Floquet analysis.
J Magn Reson. 2016 Jan 6;263:55-64
Authors: Equbal A, Leskes M, Nielsen NC, Madhu PK, Vega S
Abstract
We present a bimodal Floquet analysis of the recently introduced refocused continuous wave (rCW) solid-state NMR heteronuclear dipolar...
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01-17-2016 12:06 PM
[NMR paper] MAS solid state NMR of proteins: simultaneous (15)N- (13)CA and (15)N- (13)CO dipolar recoupling via low-power symmetry-based RF pulse schemes.
MAS solid state NMR of proteins: simultaneous (15)N- (13)CA and (15)N- (13)CO dipolar recoupling via low-power symmetry-based RF pulse schemes.
MAS solid state NMR of proteins: simultaneous (15)N- (13)CA and (15)N- (13)CO dipolar recoupling via low-power symmetry-based RF pulse schemes.
J Biomol NMR. 2015 Feb 25;
Authors: Herbst C, Bellstedt P, Görlach M, Ramachandran R
Abstract
The generation of efficient RN n (?)s,(?)k symmetry-based low-power RF pulse schemes for simultaneous (15)N-(13)CA and (15)N-(13)CO dipolar recoupling...
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02-26-2015 11:11 PM
MAS solid state NMR of proteins: simultaneous 15 Nâ?? 13 CA and 15 Nâ?? 13 CO dipolar recoupling via low-power symmetry-based RF pulse schemes
MAS solid state NMR of proteins: simultaneous 15 Nâ?? 13 CA and 15 Nâ?? 13 CO dipolar recoupling via low-power symmetry-based RF pulse schemes
Abstract
The generation of efficient RN n νs,νk symmetry-based low-power RF pulse schemes for simultaneous 15Nâ??13CA and 15Nâ??13CO dipolar recoupling is demonstrated. The method involves mixing schemes employing phase and amplitude-modulated dual band-selective 180° pulses as basic â??Râ?? element and tailoring of the RF field-modulation...
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02-25-2015 05:56 PM
[NMR paper] Efficient heteronuclear decoupling in MAS solid-state NMR using non-rotor-synchronized rCW irradiation.
Efficient heteronuclear decoupling in MAS solid-state NMR using non-rotor-synchronized rCW irradiation.
Related Articles Efficient heteronuclear decoupling in MAS solid-state NMR using non-rotor-synchronized rCW irradiation.
J Magn Reson. 2014 Jul 19;246C:104-109
Authors: Equbal A, Paul S, Mithu VS, Madhu PK, Nielsen NC
Abstract
We present new non-rotor-synchronized variants of the recently introduced refocused continuous wave (rCW) heteronuclear decoupling method significantly improving the performance relative to the original...
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08-16-2014 10:26 PM
[NMR paper] r TPPM: Towards improving solid-state NMR two-pulse phase-modulation heteronuclear dipolar decoupling sequence by refocusing.
r TPPM: Towards improving solid-state NMR two-pulse phase-modulation heteronuclear dipolar decoupling sequence by refocusing.
Related Articles r TPPM: Towards improving solid-state NMR two-pulse phase-modulation heteronuclear dipolar decoupling sequence by refocusing.
J Magn Reson. 2014 Apr 24;244C:68-73
Authors: Equbal A, Paul S, Mithu VS, Vinther JM, Nielsen NC, Madhu PK
Abstract
We present here a simple refocused modification, r TPPM, of the Two-Pulse Phase-Modulation (TPPM) heteronuclear decoupling method, which improves...
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06-01-2014 04:43 PM
[NMR paper] Refocused continuous-wave decoupling: a new approach to heteronuclear dipolar decoupling in solid-state NMR spectroscopy.
Refocused continuous-wave decoupling: a new approach to heteronuclear dipolar decoupling in solid-state NMR spectroscopy.
http://www.bionmr.com//www.ncbi.nlm.nih.gov/corehtml/query/egifs/http:--link.aip.org-jhtml-linkto.gif Related Articles Refocused continuous-wave decoupling: a new approach to heteronuclear dipolar decoupling in solid-state NMR spectroscopy.
J Chem Phys. 2012 Dec 7;137(21):214202
Authors: Vinther JM, Nielsen AB, Bjerring M, van Eck ER, Kentgens AP, Khaneja N, Nielsen NC
Abstract
A novel strategy for heteronuclear dipolar...
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06-01-2013 02:03 PM
Broadband 15Nâ??13C dipolar recoupling via symmetry-based RF pulse schemes at high MA
Abstract An approach for generating efficient
RNnnS, nk symmetry-based dual channel RF pulse schemes for γ-encoded broadband 15Nâ??13C dipolar recoupling at high magic angle spinning frequencies is presented. The method involves the numerical optimisation of the RF phase-modulation profile of the basic â??Râ?? element so as to obtain heteronuclear double quantum dipolar recoupling sequences with satisfactory magnetisation transfer characteristics. The basic â??Râ?? element was implemented as a sandwich of a small number of short pulses of equal duration with each pulse characterised by...
Significance of symmetry in the nuclear spin Hamiltonian for efficient heteronuclear dipolar decoupling in solid-state NMR: A Floquet description of supercycled rCW schemes.
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