A1 Vertaisarvioitu alkuperäisartikkeli tieteellisessä lehdessä
N-14 NMR echo in NH4ClO4 after the pulse sequence (theta(1))(x)-tau-(theta(2))(y)-t
Tekijät: Punkkinen M, Vuorimaki AH, Ylinen EE, Kaikkonen A
Kustantaja: ACADEMIC PRESS INC
Julkaisuvuosi: 1998
Lehti: Journal of Magnetic Resonance
Tietokannassa oleva lehden nimi: JOURNAL OF MAGNETIC RESONANCE
Lehden akronyymi: J MAGN RESON
Vuosikerta: 130
Numero: 2
Aloitussivu: 287
Lopetussivu: 291
Sivujen määrä: 5
ISSN: 1090-7807
DOI: https://doi.org/10.1006/jmre.1997.1305
Tiivistelmä
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.
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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