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- W953318352 abstract "We have studied the proton spin T1 relaxation dispersion for the smectic A and C phase of TBBA using time dependent fast field-cycling techniques [1] in the Larmor frequency range from) V p = 100 Hz to 10 MHz. Our investigation considerably extends recent works by Blinc et al. [2] performed with different NMR methods for frequencies greater than 140 kHz. The new experimental data are consistent with Blinc’s results for Sm C but not for Sm A. The difference is that the essential T1 dispersion observed with our technique for Sm A occurs at much lower frequencies, namely below 100 kHz, which means that the relaxation dispersion of both smectic phases looks rather similar. The T1(V p) behaviour can be described quantitatively in terms of relaxation by order fluctuations (OF), self-diffusion (SD), and a third molecular mechanism with Debye-type power spectrum (possibly rotation or a second OF contribution), if one takes into account both the local field effect and the cut-off frequencies of the OF model [1,2]. Such an analysis shows that the OF relaxation rate is of similar magnitude as for high-temperature nematics, whereas the cut-off frequencies are considerably smaller." @default.
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- W953318352 date "1980-01-01" @default.
- W953318352 modified "2023-09-23" @default.
- W953318352 title "Investigation of Molecular Motions in Smectic A and C TBBA by NMR Relaxation Dispersion" @default.
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- W953318352 doi "https://doi.org/10.1007/978-3-642-67848-6_21" @default.
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