NMR strong off-resonance irradiation without sample overheating

High homogeneity B1 30.2MHz Nuclear Magnetic Resonance Probe for off-resonance relaxation times measurements

“…It must be mentioned that both coils are supplied from the same source (transmitter), which is a great progress when compared to the solution from [2]. A difficult problem of rapid switches of high power and high frequency has also been solved in this project.…”

“…The standard probe construction with a single measurement coil (for rf pulses and for the detection of FID signal) does not prevent from overheating the substance inside the coil (which could damage the sample or change its properties) [2]. Another important parameter is the range of the frequency band of the probe.…”

“…It was not certain if together with detuning from resonance, the induction of B 1 field at the site of the sample would change. Elimination of the above problems, apart from the change in induction of B 1 field and frequency, has been the subject of interest of the authors of [2]. They proposed a solution with two transmitters.…”

Molecular dynamics of poly(ethylene terephthalate)/poly(phenylene sulfide) nanocomposites with barium titanate

“…The 1 H NMR measurements were carried out on a home made pulse spectrometer operating at 30.2 MHz [7]. The spin-lattice relaxation times T 1 in the laboratory frame were determined using a pulse sequence [ * 90 − − 90 − 90 ] as a function of temperature from 130 to 393 K. After the saturating pulses at intervals the solid echo sequence was applied and the solid echo was observed.…”

“…is presented. The spin-lattice relaxation time T 1 and the second moment M 2 were investigated of the mentioned materials [7][8][9].…”