Cp contact soft.m

Cross-polarisation experiment in the rotating frame. Applies a soft pi/2 pulse using the specified operators, then evolves the system with the specified spin-lock terms added to the Liovillian. The contact curve is returned.

Syntax

    contact_curve=cp_contact_soft(spin_system,parameters,H,R,K)

Parameters

    parameters.spins      - working spins, a cell array of
                            strings with high-gamma spins
                            first and low-gamma spins last,
                            for example {'1H','13C'}

    parameters.hi_pwr     - nutation frequency of the exci-
                            tation pulse on the high-gamma
                            spins, Hz

    parameters.cp_pwr     - nutation frequencies on the two
                            channels during the CP contact
                            time, a two-element vector, Hz

    parameters.timestep   - time step of the CP contact ti-
                            me, seconds

    parameters.nsteps     - number of time steps to take
                            during the CP contact time

    parameters.rho0       - initial state, the state of the
                            low-gamma spins will be wiped

    parameters.coil       - detection state vector

    H - Hamiltonian matrix, received from context function

    R - relaxation superoperator, received from context function

    K - kinetics superoperator, received from context function

Outputs

    contact_curve - contact curve detected on the coil
                    state specified in parameters.coil

Examples

The following output is produced by examples/nmr_solids/case_studies/mathies_carbonate/cp_mas_powder_mhc_fplanck_exchange.m file:

See Jen's paper [1] for further details.

See also

cp_contact_hard.m, cp_acquire_soft.m, overtone_cp.m, cn2d_dq.m, cn2d_sq.m, dante.m, fslghetcor.m, mqmas.m, nqr_pa.m, pdsd.m, respiration.m, wise.m, Built-in_experiments

Version 2.9, authors: Marina Carravetta, Phil Williamson, Guinevere Mathies, Ilya Kuprov