CPMG train

The exact behavior of the CPMG train of tt rf pulses interspaced by r/2 in the presence of a constant magnetic field gradient is easily described. If the first tt pulse follows the excitation at time T/4, the phase F t) time dependence is a sawtooth-shaped function oscillating about zero. From Eq. (64) we find its spectrum to be... 

Experimental methods, theory, analysis, protein applications Systematic up to 10% N T2 overestimation in 180° CPMG train Evaluation of Lipari-Szabo parameters without non-linear fit... 

Using lower-power decoupUng reduces the RF-induced heating and lowers the load on the NMR probe. It also allows longer acquisition times, which can be used to record Carr—PurceU—Meiboom—GiU (CPMG) trains of echoes and increase the S/N by one order of magnitude in favourable cases. 

According to Wiench et al. (2008), a remarkable enhancement of sensitivity can be achieved in Si solid-state NMR by applying the Carr-Purcell-Meiboom-Gill (CPMG) train of rotor-synchronized Ji pulses during the detection of Si magnetization. They used several one- and two-dimensional (ID and 2D) techniques to demonstrate the capabilities of this approach. Examples include ID Si X CPMAS spectra and 2D Si X HETCOR spectra of mesoporous silicas, zeolites, and minerals,... 

It has been demonstrated by Wiench et al that in the case of Si-Si doublequantum techniques, the well known Carr-Purcell-Meiboom-Gill(CPMG) train of rotor-synchronised n pulses during the detection of silicon magnetization can be exploited to measure homonuclear Vsi-si couplings. 

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