A1 Vertaisarvioitu alkuperäisartikkeli tieteellisessä lehdessä
Double quantum coherence of quadrupolar I=1 nuclei: N-14 in NH4ClO4
Tekijät: Ylinen EE, Kaikkonen A, Punkkinen M
Kustantaja: ELSEVIER SCIENCE BV
Julkaisuvuosi: 1997
Lehti:: Solid State Nuclear Magnetic Resonance
Tietokannassa oleva lehden nimi: SOLID STATE NUCLEAR MAGNETIC RESONANCE
Lehden akronyymi: SOLID STATE NUCL MAG
Vuosikerta: 10
Numero: 1-2
Aloitussivu: 25
Lopetussivu: 31
Sivujen määrä: 7
ISSN: 0926-2040
DOI: https://doi.org/10.1016/S0926-2040(97)00026-X
Tiivistelmä
We have calculated optimal conditions for observing the double quantum coherence of quadrupolar nuclei I = 1 in single crystals and powders after the two and three pulse sequences (theta(1))(x)-tau(1)-(theta(2))(alpha)-tau(2) [-(theta(3))(beta)-tau(3)]. Here alpha and beta the phase-cycling angles, which were incremented properly to select the desired coherence transfer pathways. Experiments for double quantum excitation and detection were performed on the single crystal and powder samples of NH4ClO4. Because of a fast decay of the signal from the powder after the two-pulse sequence, we employed the third pulse to produce an echo related to the double quantum coherence. (C) 1997 Elsevier Science B.V.
We have calculated optimal conditions for observing the double quantum coherence of quadrupolar nuclei I = 1 in single crystals and powders after the two and three pulse sequences (theta(1))(x)-tau(1)-(theta(2))(alpha)-tau(2) [-(theta(3))(beta)-tau(3)]. Here alpha and beta the phase-cycling angles, which were incremented properly to select the desired coherence transfer pathways. Experiments for double quantum excitation and detection were performed on the single crystal and powder samples of NH4ClO4. Because of a fast decay of the signal from the powder after the two-pulse sequence, we employed the third pulse to produce an echo related to the double quantum coherence. (C) 1997 Elsevier Science B.V.
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