cp_acquire.m

Cross-polarisation NMR experiment in the rotating frame. The CP stage is preceded by wiping of the low-gamma nuclei and followed by detection with decoupling of the high-gamma nuclei. For the same experiment with a slightly different parametrisation, see crosspol.m

Syntax

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

Arguments

    parameters.spins      - working isotopes, a cell array of
                            strings with high-gamma nuclei fi-
                            rst, e.g. {'1H','13C'}

    parameters.hi_pwr     - nutation frequency of the excita-
                            tion pulse on the high-gamma nuc-
                            lei, 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 nucleus 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

Version 2.8, authors: Guinevere Mathies