Heteronuclear dipolar recoupling in liquid crystals and solids by PISEMA-type pulse sequences

• A pulse sequence is described for the recoupling of heteronuclear dipolar interactions under MAS. The method is similar to the PISEMA experiment, but employs a well-defined amplitude modulation of one of the two radio-frequency fields. The technique is used for measurements of H-1-C-13 dipolar couplings in unoriented solid and liquid-crystalline samples.

Nyckelord

heteronuclear recoupling

magic-angle spinning

cross-polarization

PISEMA

liquid crystals

state nmr-spectroscopy

inversion spin-exchange

nuclear-magnetic-resonance

magic-angle nmr

cross-polarization

chemical-shift

orientational constraints

membrane-proteins

rotating solids

lipid bilayers

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ref (ämneskategori)

art (ämneskategori)