Broadband 1H homodecoupled NMR experiments: recent developments, methods and applications

In recent years, a great interest in the development of new broadband 1H homonuclear decoupled techniques providing simplified JHH multiplet patterns has emerged again in the field of small molecule NMR. The resulting highly resolved 1H NMR spectra display resonances as collapsed singlets, therefore minimizing signal overlap and expediting spectral analysis. This review aims at presenting the most recent advances in pure shift NMR spectroscopy, with a particular emphasis to the Zangger–Sterk experiment. A detailed discussion about the most relevant practical aspects in terms of pulse sequence design, selectivity, sensitivity, spectral resolution and performance is provided. Finally, the implementation of the different reported strategies into traditional 1D and 2D NMR experiments is described while several practical applications are also reviewed. Copyright © 2015 John Wiley & Sons, Ltd.

[1]  T. Parella,et al.  Broadband 1H homodecoupled NMR experiments: Recent developments, methods and applications , 2015 .

[2]  P. Clapés,et al.  Disentangling Complex Mixtures of Compounds with Near-Identical (1) H and (13) C NMR Spectra using Pure Shift NMR Spectroscopy. , 2015, Chemistry.

[3]  N. Suryaprakash,et al.  J-edited pure shift NMR for the facile measurement of (n)J(HH) for specific protons. , 2015, Chemphyschem : a European journal of chemical physics and physical chemistry.

[4]  K. Zangger,et al.  Pure shift NMR. , 2015, Progress in nuclear magnetic resonance spectroscopy.

[5]  J. Parkinson,et al.  HOBS methods for enhancing resolution and sensitivity in small DNA oligonucleotide NMR studies , 2015, Magnetic resonance in chemistry : MRC.

[6]  G. Martin,et al.  Implementing multiplicity editing in selective HSQMBC experiments. , 2015, Journal of magnetic resonance.

[7]  K. Damodaran,et al.  High‐resolution slice selection NMR for the measurement of CO2 diffusion under non‐equilibrium conditions , 2015, Magnetic resonance in chemistry : MRC.

[8]  T. Parella,et al.  Ultra high-resolution HSQC: application to the efficient and accurate measurement of heteronuclear coupling constants. , 2015, Chemical communications.

[9]  D. Stalke,et al.  Single-shot titrations and reaction monitoring by slice-selective NMR spectroscopy. , 2015, Chemical communications.

[10]  M. Nilsson,et al.  Precise Measurement of Long-Range Heteronuclear Coupling Constants by a Novel Broadband Proton–Proton-Decoupled CPMG-HSQMBC Method , 2015, Chemistry.

[11]  L. Frydman,et al.  HyperBIRD: a sensitivity-enhanced approach to collecting homonuclear-decoupled proton NMR spectra. , 2014, Angewandte Chemie.

[12]  R. W. Adams,et al.  Pure Shift NMR Spectroscopy , 2014 .

[13]  M. Nilsson,et al.  "Perfecting" pure shift HSQC: full homodecoupling for accurate and precise determination of heteronuclear couplings. , 2014, Chemical communications.

[14]  N. Suryaprakash,et al.  Quick re-introduction of selective scalar interactions in a pure-shift NMR spectrum. , 2014, Chemical communications.

[15]  Mehdi Mobli,et al.  Nonuniform sampling and non-Fourier signal processing methods in multidimensional NMR. , 2014, Progress in nuclear magnetic resonance spectroscopy.

[16]  Wolfgang Bermel,et al.  Using pure shift HSQC to characterize microgram samples of drug metabolites , 2014 .

[17]  K. Zangger,et al.  Disentangling scalar coupling patterns by real-time SERF NMR. , 2014, Chemical communications.

[18]  13Cα decoupling during direct observation of carbonyl resonances in solution NMR of isotopically enriched proteins , 2014, Journal of biomolecular NMR.

[19]  M. Foroozandeh,et al.  Ultrahigh-resolution total correlation NMR spectroscopy. , 2014, Journal of the American Chemical Society.

[20]  R. Williamson,et al.  Simultaneous (1)H and (13)C NMR enantiodifferentiation from highly-resolved pure shift HSQC spectra. , 2014, Chemical communications.

[21]  D. Oh,et al.  Application of 13C-labeling and 13C–13C COSY NMR experiments in the structure determination of a microbial natural product , 2014, Archives of pharmacal research.

[22]  K. Zangger,et al.  Directly Decoupled Diffusion-Ordered NMR Spectroscopy for the Analysis of Compound Mixtures , 2014, Chemistry.

[23]  W. Reynolds,et al.  Evaluating ASAP-HMQC and PS-HSQC NMR pulse sequences with non-uniform sampling for rapid screening of natural products , 2014 .

[24]  Lokesh Lokesh,et al.  Sensitivity enhancement in slice-selective NMR experiments through polarization sharing , 2014 .

[25]  Measurement of T₁/T₂ relaxation times in overlapped regions from homodecoupled ¹H singlet signals. , 2014, Journal of magnetic resonance.

[26]  V. M. R. Kakita,et al.  Real‐time homonuclear broadband and band‐selective decoupled pure‐shift ROESY , 2014, Magnetic resonance in chemistry : MRC.

[27]  G. Montelione,et al.  Spatially selective heteronuclear multiple-quantum coherence spectroscopy for biomolecular NMR studies. , 2014, Chemphyschem : a European journal of chemical physics and physical chemistry.

[28]  Mathias Nilsson,et al.  Ultrahigh-Resolution NMR Spectroscopy , 2014, Angewandte Chemie.

[29]  W. Bermel,et al.  Improving the sensitivity of conventional spin echo spectra by preservation of initial signal-to-noise ratio. , 2014, Journal of magnetic resonance.

[30]  M. Pérez‐Trujillo,et al.  Enantiodifferentiation through frequency-selective pure-shift (1)H nuclear magnetic resonance spectroscopy. , 2014, Chemphyschem : a European journal of chemical physics and physical chemistry.

[31]  A. Bax,et al.  Homonuclear decoupling for enhancing resolution and sensitivity in NOE and RDC measurements of peptides and proteins. , 2014, Journal of magnetic resonance.

[32]  N. Suryaprakash,et al.  Pure shift NMR approach for fast and accurate extraction of heteronuclear couplings , 2014 .

[33]  A. Harrison-Marchand,et al.  1H Pure Shift DOSY: a handy tool to evaluate the aggregation and solvation of organolithium derivatives. , 2014, Chemical communications.

[34]  M. Foroozandeh,et al.  Diastereomeric ratio determination by high sensitivity band-selective pure shift NMR spectroscopy. , 2014, Chemical communications.

[35]  M. Nilsson,et al.  Accurate determination of one-bond heteronuclear coupling constants with "pure shift" broadband proton-decoupled CLIP/CLAP-HSQC experiments. , 2014, Journal of magnetic resonance.

[36]  B. Luy,et al.  Homonuclear BIRD-decoupled spectra for measuring one-bond couplings with highest resolution: CLIP/CLAP-RESET and constant-time-CLIP/CLAP-RESET. , 2014, Journal of magnetic resonance.

[37]  G. Morris,et al.  “Pure shift” 1H NMR, a robust method for revealing heteronuclear couplings in complex spectra , 2014 .

[38]  K. Zangger,et al.  Enhancing the resolution of multi-dimensional heteronuclear NMR spectra of intrinsically disordered proteins by homonuclear broadband decoupling. , 2014, Chemical communications.

[39]  Lokesh.,et al.  RES-TOCSY: a simple approach to resolve overlapped ¹H NMR spectra of enantiomers. , 2014, Organic & biomolecular chemistry.

[40]  K. Zangger,et al.  Boosting the resolution of 1H NMR spectra by homonuclear broadband decoupling. , 2014, Chemphyschem : a European journal of chemical physics and physical chemistry.

[41]  Mark W Maciejewski,et al.  Nonuniform sampling and maximum entropy reconstruction in multidimensional NMR. , 2014, Accounts of chemical research.

[42]  M. Tashiro,et al.  BASHD‐J‐resolved‐HMBC, an efficient method for measuring proton–proton and heteronuclear long‐range coupling constants , 2014, Magnetic resonance in chemistry : MRC.

[43]  T. Parella,et al.  Implementing homo- and heterodecoupling in region-selective HSQMBC experiments. , 2014, Journal of magnetic resonance.

[44]  T. Parella,et al.  Full sensitivity and enhanced resolution in homodecoupled band-selective NMR experiments. , 2013, Chemistry.

[45]  M. Foroozandeh,et al.  A toolbox of HSQC experiments for small molecules at high 13C‐enrichment. Artifact‐free, fully 13C‐homodecoupled and JCC‐encoding pulse sequences , 2013, Magnetic resonance in chemistry : MRC.

[46]  T. Parella,et al.  Simultaneous multi-slice excitation in spatially encoded NMR experiments. , 2013, Chemistry.

[47]  M. Pérez‐Trujillo,et al.  13C NMR spectroscopy for the differentiation of enantiomers using chiral solvating agents. , 2013, Analytical chemistry.

[48]  D. Stalke,et al.  Toluene and lithium amide diffusion into polystyrene: a slice-selective NMR-spectroscopic study. , 2013, Chemphyschem : a European journal of chemical physics and physical chemistry.

[49]  M. Foroozandeh,et al.  Simultaneously Enhancing Spectral Resolution and Sensitivity in Heteronuclear Correlation NMR Spectroscopy , 2013, Angewandte Chemie.

[50]  M. E. Di Pietro,et al.  GET-SERF, a new gradient encoded SERF experiment for the trivial edition of 1H-19F couplings. , 2013, Journal of magnetic resonance.

[51]  K. Zangger,et al.  Broadband homodecoupled NMR spectroscopy with enhanced sensitivity. , 2013, Journal of magnetic resonance.

[52]  K. Zangger,et al.  A general method for diagonal peak suppression in homonuclear correlated NMR spectra by spatially and frequency selective pulses☆ , 2013, Journal of magnetic resonance.

[53]  K. Zangger,et al.  Simplifying Proton NMR Spectra by Instant Homonuclear Broadband Decoupling , 2013, Angewandte Chemie.

[54]  R. Gil,et al.  Probing spatial distribution of alignment by deuterium NMR imaging. , 2013, Chemistry.

[55]  Wolfgang Bermel,et al.  Monitoring fast reactions by spatially-selective and frequency-shifted continuous NMR spectroscopy: application to rapid-injection protein unfolding. , 2013, Chemical communications.

[56]  W. Bermel,et al.  Broadband homodecoupled heteronuclear multiple bond correlation spectroscopy. , 2013, Journal of magnetic resonance.

[57]  M. Nilsson,et al.  Detection of Potential TNA and RNA Nucleoside Precursors in a Prebiotic Mixture by Pure Shift Diffusion-Ordered NMR Spectroscopy , 2013, Chemistry.

[58]  J. Koivisto Zero-quantum filtered pure shift TOCSY. , 2013, Chemical communications.

[59]  N. Suryaprakash,et al.  Chiral discrimination and the measurement of enantiomeric excess from a severely overcrowded NMR spectrum , 2013 .

[60]  M. Tashiro,et al.  BASHD‐J‐resolved‐COSY: a new method for measuring proton‐proton spin coupling constants of multiplet signals , 2012, Magnetic resonance in chemistry : MRC.

[61]  Polychromatic decoupling of a manifold of homonuclear scalar interactions in solution-state NMR. , 2012, Chemistry.

[62]  N. Khaneja,et al.  Homonuclear decoupling for liquid-state NMR. , 2012, The Journal of chemical physics.

[63]  Adam A Colbourne,et al.  Decoupling two-dimensional NMR spectroscopy in both dimensions: pure shift NOESY and COSY. , 2012, Angewandte Chemie.

[64]  Owen M. McDougal,et al.  Origin and correction of magnetic field inhomogeneity at the interface in biphasic NMR samples. , 2012, Journal of magnetic resonance.

[65]  Lucio Frydman,et al.  Toward single-shot pure-shift solution 1H NMR by trains of BIRD-based homonuclear decoupling. , 2012, Journal of magnetic resonance.

[66]  G. Bodenhausen,et al.  Spin echo NMR spectra without J modulation. , 2012, Chemical communications.

[67]  M. Foroozandeh,et al.  Combination of homonuclear decoupling and spectral aliasing to increase the resolution in the (1)H dimension of 2D NMR experiments. , 2012, Chimia.

[68]  M. Nilsson,et al.  Simple proton spectra from complex spin systems: pure shift NMR spectroscopy using BIRD. , 2011, Angewandte Chemie.

[69]  D. Kumari,et al.  Application of selective F-1 decoupled H-1 NMR for enantiomer resolution and accurate measurement of enantiomeric excess at low chiral substrate/auxiliary concentration , 2011 .

[70]  D. Rabenstein,et al.  Determination of the primary structure and carboxyl pKAs of heparin-derived oligosaccharides by band-selective homonuclear-decoupled two-dimensional 1H NMR , 2010, Analytical and bioanalytical chemistry.

[71]  T. Parella,et al.  IPAP-HSQMBC: measurement of long-range heteronuclear coupling constants from spin-state selective multiplets. , 2010, Journal of magnetic resonance.

[72]  U. Prabhu,et al.  Visualization of enantiomers and determination of homo- and hetero-nuclear residual dipolar and scalar couplings: The natural abundant 13C edited J/D-resolved NMR techniques , 2010 .

[73]  Fast multidimensional localized parallel NMR spectroscopy for the analysis of samples , 2010, Magnetic resonance in chemistry : MRC.

[74]  M. Nilsson,et al.  True chemical shift correlation maps: a TOCSY experiment with pure shifts in both dimensions. , 2010, Journal of the American Chemical Society.

[75]  M. Foroozandeh,et al.  Deciphered chemical shifts in aliased spectra recorded with two slightly different narrow windows or differential chemical shift evolution. , 2010, Chemphyschem : a European journal of chemical physics and physical chemistry.

[76]  Claire Mantel,et al.  Study of liquid–liquid interfaces by an easily implemented localized NMR sequence , 2010, Magnetic resonance in chemistry : MRC.

[77]  Mathias Nilsson,et al.  Pure shift 1H NMR: a resolution of the resolution problem? , 2010, Angewandte Chemie.

[78]  J. Courtieu,et al.  Nuclear magnetic resonance using a spatial frequency encoding: application to J-edited spectroscopy along the sample. , 2010, Angewandte Chemie.

[79]  U. Prabhu,et al.  Application of z-COSY experiment and its variant for accurate chiral discrimination by (1)H NMR. , 2010, Journal of magnetic resonance.

[80]  Mark R Viant,et al.  Two-dimensional J-resolved NMR spectroscopy: review of a key methodology in the metabolomics toolbox. , 2010, Phytochemical analysis : PCA.

[81]  Jean-Marc Nuzillard,et al.  Spectral aliasing: a super zoom for 2D-NMR spectra. Principles and applications. , 2010, Chimia.

[82]  B. Luy Adiabatic z-filtered J-spectroscopy for absorptive homonuclear decoupled spectra. , 2009, Journal of magnetic resonance.

[83]  J. MacMillan,et al.  Deconvolution of complex NMR spectra in small molecules by multi frequency homonuclear decoupling (MDEC). , 2009, Journal of the American Chemical Society.

[84]  W. Bermel,et al.  Experimental access to HSQC spectra decoupled in all frequency dimensions. , 2009, Journal of magnetic resonance.

[85]  J. Courtieu,et al.  Application of a 1H δ‐resolved 2D NMR experiment to the visualization of enantiomers in chiral environment, using sample spatial encoding and selective echoes , 2009, Magnetic resonance in chemistry : MRC.

[86]  High-precision heteronuclear 2D NMR experiments using 10-ppm spectral window to resolve carbon overlap. , 2009, Chemical communications.

[87]  H. Kessler,et al.  The CLIP/CLAP-HSQC: pure absorptive spectra for the measurement of one-bond couplings. , 2008, Journal of magnetic resonance.

[88]  J. Keeler,et al.  Two-dimensional J-spectra with absorption-mode lineshapes. , 2007, Journal of magnetic resonance.

[89]  D. Rabenstein,et al.  Determination of residue-specific acid dissociation constants for peptides by band-selective homonuclear-decoupled (1)H NMR. , 2007, Analytical chemistry.

[90]  D. Jeannerat Computer optimized spectral aliasing in the indirect dimension of (1)H-(13)C heteronuclear 2D NMR experiments. A new algorithm and examples of applications to small molecules. , 2007, Journal of magnetic resonance.

[91]  R. Edden,et al.  Broadband proton‐decoupled proton spectra , 2007, Magnetic resonance in chemistry : MRC.

[92]  M. Nilsson,et al.  Pure shift proton DOSY: diffusion-ordered 1H spectra without multiplet structure. , 2007, Chemical communications.

[93]  Ray Freeman,et al.  Fast multidimensional NMR by polarization sharing , 2007, Magnetic resonance in chemistry : MRC.

[94]  Acquisition regime for high-resolution heteronuclear 2D NMR spectra. , 2006, Angewandte Chemie.

[95]  Ki D Park,et al.  Slice‐selected LED and BPPLED: application of slice selection to DOSY , 2006, Magnetic resonance in chemistry : MRC.

[96]  D. Borchardt,et al.  Improved resolution in two‐dimensional 1H NMR spectra of peptides by band‐selective, homonuclear decoupling during both the evolution and acquisition periods: application to characterization of the binding of peptides by heparin , 2006, Magnetic resonance in chemistry : MRC.

[97]  C. Griesinger,et al.  Resolution enhancement in spectra of natural products dissolved in weakly orienting media with the help of 1H homonuclear dipolar decoupling during acquisition: application to 1H-13C dipolar couplings measurements. , 2006, Journal of magnetic resonance.

[98]  R. Edden,et al.  Suppression of strong coupling artefacts in J-spectra. , 2005, Journal of magnetic resonance.

[99]  Xiaolian Gao,et al.  IP‐COSY, a totally in‐phase and sensitive COSY experiment , 2005, Magnetic resonance in chemistry : MRC.

[100]  Yoram Cohen,et al.  Diffusion NMR spectroscopy in supramolecular and combinatorial chemistry: an old parameter--new insights. , 2005, Angewandte Chemie.

[101]  Konstantin Pervushin,et al.  Simultaneous 1H- or 2H-, 15N- and multiple-band-selective 13C-decoupling during acquisition in 13C-detected experiments with proteins and oligonucleotides , 2005, Journal of biomolecular NMR.

[102]  J. C. Cobas,et al.  A homodecoupled diffusion experiment for the analysis of complex mixtures by NMR. , 2004, Journal of magnetic resonance.

[103]  R. Griffin,et al.  Single-scan longitudinal relaxation measurements in high-resolution NMR spectroscopy. , 2003, Journal of magnetic resonance.

[104]  D. Jeannerat High resolution in heteronuclear 1H–13C NMR experiments by optimizing spectral aliasing with one‐dimensional carbon data , 2003 .

[105]  Lucio Frydman,et al.  The acquisition of multidimensional NMR spectra within a single scan , 2002, Proceedings of the National Academy of Sciences of the United States of America.

[106]  B. Antalek Using pulsed gradient spin echo NMR for chemical mixture analysis: how to obtain optimum results , 2002 .

[107]  C. Larive,et al.  The 2D-J-DOSY experiment: resolving diffusion coefficients in mixtures. , 2002, Journal of magnetic resonance.

[108]  G. Wagner,et al.  Homonuclear Decoupling in Proteins , 2002 .

[109]  W. Chuang,et al.  Determination of the primary structures of heparin- and heparan sulfate-derived oligosaccharides using band-selective homonuclear-decoupled two-dimensional 1H NMR experiments. , 2001, Analytical chemistry.

[110]  D. Canet,et al.  A procedure for obtaining pure absorption 2D J-spectra: application to quantitative fully J-decoupled homonuclear NMR spectra. , 1999, Journal of magnetic resonance.

[111]  E. Kupče,et al.  Line narrowing in spectra of proteins dissolved in a dilute liquid crystalline phase by band-selective adiabatic decoupling: Application to 1HN-15N residual dipolar coupling measurements , 1999, Journal of biomolecular NMR.

[112]  P. Kingsley,et al.  Methods of measuring spin-lattice ( T 1 ) relaxation times: an annotated bibliography , 1999 .

[113]  Charles S. Johnson Diffusion Ordered Nuclear Magnetic Resonance Spectroscopy: Principles and Applications , 1999 .

[114]  P. Kingsley,et al.  Signal intensities and T 1 calculations in multiple-echo sequences with imperfect pulses , 1999 .

[115]  D. Rabenstein,et al.  An ω1‐band‐selective, ω1‐homonuclear decoupled ROESY experiment: application to the assignment of 1H NMR spectra of difficult‐to‐assign peptide sequences , 1998 .

[116]  A. J. Shaka,et al.  Application of the filter diagonalization method to one- and two-dimensional NMR spectra , 1998, Journal of magnetic resonance (San Diego, Calif. 1997 : Print).

[117]  K. Zangger,et al.  Homonuclear Broadband-Decoupled NMR Spectra , 1997 .

[118]  V. Krishnamurthy Application of Semi‐Selective Excitation Sculpting for Homonuclear Decoupling During Evolution in Multi‐Dimensional NMR , 1997 .

[119]  R. Freeman,et al.  Proton Chemical-Shift Spectra , 1997 .

[120]  E. Kupče,et al.  Multisite band-selective decoupling in proteins. , 1996, Journal of magnetic resonance. Series B.

[121]  J. Weigelt,et al.  Removal of zero-quantum coherence in protein NMR spectra using SESAM decoupling and suppression of decoupling sidebands. , 1996, Journal of magnetic resonance. Series B.

[122]  J. Nuzillard Time-Reversal of NMR Signals by Linear Prediction. Application to Phase-Sensitive HomonuclearJ-Resolved Spectroscopy , 1996 .

[123]  E. Kupče,et al.  Wideband Homonuclear Decoupling in Protein Spectra , 1995 .

[124]  G. Bodenhausen,et al.  Broadband decoupling in NMR with frequency-modulated "chirp" pulses , 1995 .

[125]  R. Freeman,et al.  Elimination of Spin-Spin Splittings from High-Resolution Proton NMR Spectra , 1994 .

[126]  G. Otting,et al.  Improved Spectral Resolution in 1H NMR Spectroscopy by Homonuclear Semiselective Shaped Pulse Decoupling during Acquisition , 1994 .

[127]  R. Freeman,et al.  "Decoupled" Proton NMR Spectra , 1994 .

[128]  M. Girvin Increased Sensitivity of COSY Spectra by Use of Constant-Time t1 Periods (CT COSY) , 1994 .

[129]  R. Freeman,et al.  Band-Selective Decoupling , 1993 .

[130]  D. Uhrín,et al.  Modified BIRD Pulses and Design of Heteronuclear Pulse Sequences , 1993 .

[131]  F. V. D. Ven,et al.  Optimization of constant-time evolution in multidimensional NMR experiments , 1992 .

[132]  L. Mueller,et al.  Selective shaped pulse decoupling in NMR: homonuclear [carbon-13]carbonyl decoupling , 1992 .

[133]  P. Wright,et al.  Improved resolution in three-dimensional constant-time triple resonance NMR spectroscopy of proteins , 1992, Journal of biomolecular NMR.

[134]  R. Brüschweiler,et al.  Combined use of hard and soft pulses for ω1 decoupling in two-dimensional NMR spectroscopy , 1988 .

[135]  B. Farmer,et al.  Incorporation of ω1 decoupling, uniform excitation, and diagonal suppression in a double-quantum filtered COSY experiment , 1987 .

[136]  R. R. Ernst,et al.  Time reversal of the evolution under scalar spin-spin interactions in NMR. Application for .omega.1 decoupling in two-dimensional NOE spectroscopy , 1985 .

[137]  A. J. Shaka,et al.  Computer-optimized decoupling scheme for wideband applications and low-level operation , 1985 .

[138]  Kurt Wüthrich,et al.  Application of ω1-decoupled 2D correlation spectra to the study of proteins , 1984 .

[139]  A. J. Shaka,et al.  Separation of chemical shifts and spin coupling in proton NMR: elimination of dispersion signals from two-dimensional spectra , 1984 .

[140]  A. Bax Broadband homonuclear decoupling in heteronuclear shift correlation NMR spectroscopy , 1983 .

[141]  A. J. Shaka,et al.  An improved sequence for broadband decoupling: WALTZ-16 , 1983 .

[142]  A. Pines,et al.  Bilinear rotation decoupling of homonuclear scalar interactions , 1982 .

[143]  Ray Freeman,et al.  Broadband heteronuclear decoupling , 1982 .

[144]  Ad Bax,et al.  Investigation of complex networks of spin-spin coupling by two-dimensional NMR , 1981 .

[145]  A. Bax,et al.  A simple method for suppressing dispersion-mode contributions in NMR spectra: The “pseudo echo” , 1981 .

[146]  Ad Bax,et al.  Homonuclear broadband-decoupled absorption spectra, with linewidths which are independent of the transverse relaxation rate , 1979 .

[147]  Richard R. Ernst,et al.  Homonuclear broad band decoupling and two-dimensional J-resolved NMR spectroscopy , 1976 .

[148]  P. Meakin,et al.  Homonuclear decoupling and peak elimination in Fourier transform nuclear magnetic resonance , 1973 .

[149]  Ray Freeman,et al.  Influence of a Second Radiofrequency Field on High‐Resolution Nuclear Magnetic Resonance Spectra , 1962 .

[150]  S. Meiboom,et al.  Modified Spin‐Echo Method for Measuring Nuclear Relaxation Times , 1958 .

[151]  E. Purcell,et al.  Effects of Diffusion on Free Precession in Nuclear Magnetic Resonance Experiments , 1954 .