Related Methods Pulsed Field Gradient NMR and Dynamic Light Scattering

PFGNMR measures the ratio T of an NMR spin-echo signal A, which is observed after two field gradient pulses g are applied in a pulse sequence n/2-g-tt/2, compared to the signal Aq from the same sequence without gradient pulses  

NIST-NSE Generic INll NIST, Gaithers-hurg,USA [24] 

MESS Generic INll LLB, Saclay, France www.Ub.cea.fr/spectros/spectros e.html 

RESEDA Zero-field FRM2,TUM, Munich, Germany www.frm2.tu-muenchen.de 

This effective Q,t-range overlaps with that of DLS. DLS measures the dynamics of density or concentration fluctuations by autocorrelation of the scattered laser light intensity in time. The intensity fluctuations result from a change of the random interference pattern (speckle) from a small observation volume. The size of the observation volume and the width of the detector opening determine the contrast factor C of the fluctuations (coherence factor). The normalized intensity autocorrelation function g Q,t) relates to the field amplitude correlation function g (Q,t) in a simple way g t)=l+C g t) if Gaussian statistics holds [30]. g Q,t) represents the correlation function of the fluctuat- 

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