Velocity autocorrelation spectra of fluid in porous media measured by the CPMG sequence and constant magnetic field gradient |
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Authors: | Stepisnik Janez Lasic Samo Mohoric Ales Sersa Igor Sepe Ana |
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Affiliation: | University of Ljubljana, FMF Physics Department, J. Stefan Institute, 1000 Ljubljana, Slovenia. janez.stepisnik@fmf.uni-lj.si |
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Abstract: | Carr-Purcell-Meiboom-Gill (CPMG) train of radiofrequency pulses applied to spins in the constant magnetic field gradient is an efficient variant of the modulated magnetic field gradient spin echo method, which provides information about molecular diffusion in the frequency domain instead of in the time domain as with the two-pulse gradient spin echo. The frequency range of this novel technique is broad enough to sample the power spectrum of displacement fluctuation in water-saturated pulverized silica (SiO2) and provides comprehensive information about the molecular restricted motion as well as about the structure of the medium. |
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Keywords: | Magnetic resonance Porous media Diffusion Modulated gradient spin echo Velocity correlation function CPMG sequence |
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