NMR measurements of diffusion in concentrated samples: avoiding problems with radiation damping |
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| Authors: | Connell Mark A Davis Adrian L Kenwright Alan M Morris Gareth A |
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| Institution: | (1) Department of Chemistry, University of Manchester, Oxford Rd, Manchester , M13 9PL, United Kingdom;(2) Pfizer Global Research and Development, Sandwich, Kent, CT13 9NJ, United Kingdom;(3) Department of Chemistry, University of Durham, Durham, DH1 3LE, United Kingdom |
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| Abstract: | Pulsed field gradient spin echo NMR is generally the method of choice for diffusion measurements on liquid samples. With modern high field instruments, however, severe problems can arise when it is applied to samples with very high proton concentrations because of the presence of radiation damping. The problems may be greatly reduced by a suitable choice of experimental parameters, in particular the use of modified stimulated echo pulse sequences with a reduced flip angle for the first pulse. |
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| Keywords: | Diffusion Radiation damping DOSY Water Siloxanes |
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