14N NMR Echo in NH4ClO4after the Pulse Sequence (θ1)x–τ–(θ2)y–t

Autor:	A. Kaikkonen, Eero Ylinen, A.H. Vuorimäki, Matti Punkkinen
Rok vydání:	1998
Předmět:	Nuclear and High Energy Physics Chemistry Nutation Echo (computing) Echo signal Biophysics Pulse sequence Condensed Matter Physics Biochemistry Spectral line B1 field Crystal symbols.namesake Nuclear magnetic resonance Fourier analysis symbols
Zdroj:	Journal of Magnetic Resonance. 130:287-291
ISSN:	1090-7807
DOI:	10.1006/jmre.1997.1305
Popis:	We have derived a closed-form expression for the solid echo signal of quadrupolar I = 1 nuclei after the pulse sequence (theta1)x-tau-(theta2)y-t for arbitrary values of the RF nutation frequency omega1 = gammaB1 and the quadrupolar frequency omegaQ. 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 14N nuclei in NH4ClO4 crystal. Conditions for obtaining the maximal echo in powder samples are presented. A very low B1 field together with long RF pulses may distort even the central part of the spectrum, resulting in strange looking apparent spectra.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::8eecc7b997f76a1476983e540b40c9b1 https://doi.org/10.1006/jmre.1997.1305 Zobrazit plný text záznamu Full Text from ScienceDirect