mqs_refocus.m

Multiple quantum correlation pulse sequence with refocusing.

Syntax

    fid=mqs_refocus(spin_system,parameters,H,R,K)

Parameters

    parameters.sweep              [F1 F2] sweep widths (Hz)

    parameters.npoints            [F1 F2] numbers of fid points

    parameters.spins              {F1 F2} nuclei, in this case: 
                                  {'1H','1H'} 

    parameters.angle              flip angle for the final 
                                  pulse, radians  

    parameters.mqorder            coherence orders to select,
                                  a two-element integer array

    parameters.delay_1            first evolution delay, seconds

    parameters.delay_2            second evolution delay, seconds

    parameters.rho0               initial state

    parameters.coil               detection state

    H - Hamiltonian superoperator, provided by the context function

    R - relaxation superoperator, provided by the context function

    K - kinetics superoperator, provided by the context function

Outputs

    fid - 2D free induction decay for amplitude-mode processing

Notes

This implementation is homonuclear in practice and uses exact analytical coherence-order projection rather than an explicit phase cycle.

Examples

A SQ/MQ correlation spectrum simulation for a six-spin system (examples/nmr_liquids/mqs_six_spin.m) appears below.

See also

hsqc.m, hmqc.m, cosy.m, tocsy.m

Version 2.3, authors: Maria Grazia Concilio