DOI

Nucleus cross-polarization technique in a rotating frame of reference is analyzed as applied to NMR experiments with sample magic-angle spinning. The concept of simultaneous phase and amplitude modulation is suggested. According to this suggestion, the form of the Hamiltonian of recoupled dipolar interaction remains unchanged if phase inversion is accompanied by inversion of the difference of radio-frequency (RF) field amplitudes. A theoretical treatment is given in terms of the average Hamiltonian theory. The concept is demonstrated experimentally and by numerical analysis for several particular cases. Periodic phase inversion in cross-polarization experiments was shown to have the practically important advantage of suppressing chemical shift interactions and the effect of inaccurate tuning of RF field parameters.

Язык оригиналаанглийский
Страницы (с-по)91-101
Число страниц11
ЖурналJournal of Experimental and Theoretical Physics
Том102
Номер выпуска1
DOI
СостояниеОпубликовано - 21 мар 2006

    Предметные области Scopus

  • Физика и астрономия (все)

ID: 36973308