Bloch-Siegert phase shift compensated PIPs

BLOCH-SIEGERT PHASE SHIFT COMPENSATED PIPS 5.1. Bloch-Siegert phase shift 

Bloch-Siegert phase shift is usually introduced in homonuclear nuclear decoupling with an inversion pulse that is far off-resonance to the spins in precession. To minimize the disturbance, the strength of the inversion pulse 

To have a proper excitation range or the RF field strength, usually only m= 1 or 2 is used, leading to f = A//V3 and f = A//VT5, respectively. 

The 13CO inversion pulse can be achieved by a PIP with the carrier placed at the centre of the 13C . This inversion PIP causes an additional procession of the 13C spins. The amount of the phase shift in the rotating frame of the 13CO, where the centre of the 13CO spins is on-resonance to the inversion PIP, can be calculated 

As shown in the above equation, the BSPS is non-linear in respect to the offset S. 

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Bloch-Siegert Phase Shift Compensated PIPs 36... 

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