Unformatted text preview: o 15 x 1 2 Beginning with Pulse 90 on N: This is followed by a j-coupling evolution period, which only effects the coherence term: cos( ) sin( ) assuming a perfect transfer ( z z z y y z x z x I S I S S J I S J I S ρ π τ = + =-= -+ = o 1 15 3 1 4 1 = ). 2 Then, simultaneous 90 pulses on H and N: This is followed by another j-coupling evolution period to refocus the new H coherence. cos( ) sin( ) assuming perfect refo y z y z x x J I S I S J I J I τ = =-= -1 cusing ( = , because the 2 coupling is between one pair of spins). J...
View Full Document
- Fall '09
- Equilibrium, Nuclear magnetic resonance, j-coupling evolution period, narrower excitation profile