N-14 NMR echo in NH4ClO4 after the pulse sequence (theta(1))(x)-tau-(theta(2))(y)-t



: Punkkinen M, Vuorimaki AH, Ylinen EE, Kaikkonen A

Publisher: ACADEMIC PRESS INC

: 1998

Journal of Magnetic Resonance

JOURNAL OF MAGNETIC RESONANCE

: J MAGN RESON

: 130

: 2

: 287

: 291

: 5

: 1090-7807

DOI: https://doi.org/10.1006/jmre.1997.1305


We have derived a closed-form expression for the solid echo signal of quadrupolar I = 1 nuclei after the pulse sequence (theta(1))(x) tau-(theta(2))(y)-t for arbitrary values of the RF nutation frequency omega(1) = gamma B-1 and the quadrupolar frequency omega(Q). In the case of single crystals both the true echo term of this expression and its induction-signal-like terms are important as shown by experiments on N-14 nuclei in NH4ClO4 crystal. Conditions for obtaining the maximal echo in powder samples are presented, A very low B-1 field together with long RF pulses may distort even the central part of the spectrum, resulting in strange looking apparent spectra. (C) 1998 Academic Press.



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