β Scribed by Evelyn E. Babcock; Ralph P. Mason; Peter P. Antich
No coin nor oath required. For personal study only.
The effect of homonuclear J modulation on 19F spin-echo images is evidenced by a substantial reduction in signal when the echo time, TE, approaches 1/2J, with a subsequent increase in signal at longer TEs. Suppression of the J-modulation effect is demonstrated using chemical shift-selective 180 degrees refocusing pulses.
π SIMILAR VOLUMES
A computer simulation has been used to calculate the effects of J coupling on the amplitudes of echoes produced by CPMG sequences. The program computes the evolution of the density matrix for different pulse intervals and can predict the signals obtainable from spin systems of any size and complexit
## Abstract A numerical simulation tool was developed to calculate the echo amplitudes of Jβcoupled resonances within a series of radiofrequency (RF) refocused echoes. The signal modulation due to Jβcoupling in rapid acquisition with relaxation enhancement (RARE) is suppressed only when the inverse
Transverse relaxation time measurements in homonuclear coupled systems by spin-echo experiments exhibit signal modulation by scalar spin-spin coupling (J modulation). This is the major diffkulty for the measurement of accurate intensities. We show a modified spin-echo sequence which allows the remov
Electron spin-echo envelope modulation (ESEEM) spectroscopy is widely used to investigate the active sites of biological molecules in frozen solutions. Various cryoprotection techniques, particularly the addition of co-solvents, are commonly employed in the preparation of such samples. In conjunctio