Determination of dipole coupling constants using heteronuclear multiple quantum NMR
The problem of extracting dipole couplings from a system of N spins I = 1/2 and one spin S by NMR techniques is analyzed. The resolution attainable using a variety of single quantum methods is reviewed. The theory of heteronuclear multiple quantum (HMQ) NMR is developed, with particular emphasis being placed on the superior resolution available in HMQ spectra. Several novel pulse sequences are introduced, including a two-step method for the excitation of HMQ coherence. Experiments on partially oriented (1-/sup 13/C) benzene demonstrate the excitation of the necessary HMQ coherence and illustrate the calculation of relative line intensities. Spectra of high order HMQ coherence under several different effective Hamiltonians achievable by multiple pulse sequences are discussed. A new effective Hamiltonian, scalar heteronuclear recoupled interactions by multiple pulse (SHRIMP), achieved by the simultaneous irradiation of both spin species with the same multiple pulse sequence, is introduced. Experiments are described which allow heteronuclear couplings to be correlated with an S-spin spreading parameter in spectra free of inhomogeneous broadening.
- Research Organization:
- Department of Chemistry and Lawrence Berkeley Laboratory, University of California, Berkeley, California 94720
- OSTI ID:
- 5012752
- Journal Information:
- J. Chem. Phys.; (United States), Vol. 77:6
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
SUPERCONDUCTIVITY AND SUPERFLUIDITY
DIPOLES
COUPLING
NUCLEI
BENZENE
CHLORINE 31
HAMILTONIANS
LIQUID CRYSTALS
NUCLEAR MAGNETIC RESONANCE
RESOLUTION
SOLIDS
SPIN
SPIN ORIENTATION
ANGULAR MOMENTUM
AROMATICS
CHLORINE ISOTOPES
CRYSTALS
FLUIDS
HYDROCARBONS
ISOTOPES
LIGHT NUCLEI
LIQUIDS
MAGNETIC RESONANCE
MATHEMATICAL OPERATORS
MULTIPOLES
ODD-EVEN NUCLEI
ORGANIC COMPOUNDS
ORIENTATION
PARTICLE PROPERTIES
QUANTUM OPERATORS
RESONANCE
656000* - Condensed Matter Physics