Title :
Correcting high precision pulsed NMR flux density measurements for asymmetries in the lineshape
Author :
Flowers, J.L. ; Franks, P.W. ; Petley, B.W.
Author_Institution :
Centre for Basic Metrol., Nat. Phys. Lab., Teddington, UK
fDate :
4/1/1995 12:00:00 AM
Abstract :
Flux density measurements at the highest accuracy obtained via nuclear magnetic resonance differ from the average flux density over the sample. Spatial variations of the flux density cause line-shape asymmetries which shift the measured frequency by a measurement-method-dependent amount. A method has been devised for correcting for this effect experimentally
Keywords :
constants; frequency measurement; gyromagnetic ratio; helium; magnetic flux; nuclear magnetic resonance; spectral line shift; water; H2O; He; asymmetries; flux density measurement; free induction decay; high precision pulsed NMR flux density measurement; line-shape asymmetries; lineshape; measured frequency; nuclear magnetic resonance; spatial variations; Density measurement; Frequency measurement; Gyromagnetism; Magnetic flux; Nuclear magnetic resonance; Nuclear measurements; Protons; Pulse measurements; Shape; Temperature dependence;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
