sin a sinβ=h2[cos(a+β)-cos(a-B In the same way, Iy leads to an in-phase dublet 90 out of phase(dispersive)and 2 Ily I2z to a ispersive anti-phase dublet di Some applications 1. For solvent signal suppression in ID spectra, the Jump-Return sequence can be used 90°(x)-τ-90°(x)- acquisition Calculate the excitation profile with product operator formalism 2. What happens to chemical shift evolution during this sequence, and what about J coupling? Calculate 90°(x)-τ-180°(x)-τ 90°(x)-τ-180°(u)-τ35 sin a sin b = 1 /2 [cos (a+b) - cos (a-b)] In the same way, Iy leads to an in-phase dublet 90° out of phase (=dispersive) and 2 I1y I2z to a dispersive anti-phase dublet. Some applications 1. For solvent signal suppression in 1D spectra, the Jump-Return sequence can be used: 90°(x) - t - 90°(x) - acquisition Calculate the excitation profile with product operator formalism! 2. What happens to chemical shift evolution during this sequence, and what about J coupling? Calculate! 90°(x) - t - 180°(x) - t - 90°(x) - t - 180°(y) - t -