1H nutation experiments under low-amplitude radiofrequency fields. Quantitative analysis of a complex NMR signal arising from water in clays and including a Pake doublet.
It is shown theoretically and experimentally that, under weak radiofrequency (RF) field conditions, nutation frequency depends on relaxation times. The Fourier transform of a nutation curve, which is obtained by plotting signal amplitude as a function of RF field application time, yields separate bands corresponding to the components of an unresolved composite signal. This can be effectively achieved provided that these components possess different relaxation characteristics. Using proton nuclear magnetic resonance, this new method is applied to the study of water in clays and leads to the proportion of different types of water. The case where one water species appears in the form of a Pake doublet is considered.
Trausch
Grégory
G
Méthodologie RMN, UMR CNRS-UHP 7565, Université Henri Poincaré, Faculté des Sciences, Boulevard des Aiguillettes, BP 239, 54506 Vandoeuvre-lès-Nancy Cedex, France.
Canet
Daniel
D
D000538:Aluminum Silicates / Q000737:chemistry*; D000077215:Clay; D005583:Fourier Analysis; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D011522:Protons; D011846:Radio Waves; D012815:Signal Processing, Computer-Assisted; D013997:Time Factors; D014867:Water / Q000032:analysis / Q000737:chemistry*
D000538:Aluminum Silicates; D011522:Protons; D014867:Water; D000077215:Clay