Cp acquire soft.m

Cross-polarisation experiment in the rotating frame, followed by time-domain FID acquisition. The CP stage is preceded by wiping of the low-gamma spins and followed by FID acquisition with decoupling of the high-gamma spins.

Syntax

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

Arguments

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

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

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

    parameters.cp_dur     - duration of the contact time, s

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

    parameters.coil       - detection state

    H - Hamiltonian matrix, received from context function

    R - relaxation superoperator, received from context function

    K - kinetics superoperator, received from context function

Outputs

    fid - signal detected on the coil state during 
          system evolution

Examples

Below is the output of examples/nmr_solids/cp_acquire_mas_gly.m example file, showing 1H-13C cross-polarisation followed by acquisition under magic angle spinning in alpha-glycine powder.

See also

Solid state NMR experiments

cp_contact_soft.m, cp_contact_hard.m, overtone_cp.m

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