# Floquet.m

Floquet magic angle spinning context. Generates a Liouvillian super- operator and passes it on to the pulse sequence function, which sho- uld be supplied as a handle. Syntax:

   answer=floquet(spin_system,pulse_sequence,parameters,assumptions)


where pulse sequence is a function handle to one of the pulse sequences located in the experiments directory, assumptions is a string that would be passed to assume.m when the Hamiltonian is built and parameters is a structure with the following subfields:

  parameters.rate     - spinning rate in Hz

  parameters.axis     - spinning axis, given as a normalized
3-element vector

  parameters.spins    - a cell array giving the spins that
the pulse sequence involves, e.g.
{'1H','13C'}

  parameters.offset   - a cell array giving transmitter off-
sets in Hz on each of the spins listed
in parameters.spins array

  parameters.max_rank - maximum harmonic rank to retain in
the solution (increase till conver-
gence is achieved, approximately
equal to the number of spinning si-
debands in the spectrum)

  parameters.grid     - spherical grid file name. See grids
directory in the kernel.


Additional subfields may be required by the pulse sequence. The parameters structure is passed to the pulse sequence with the following additional parameters set:

  parameters.spc_dim  - matrix dimension for the spatial
dynamics subspace

  parameters.spn_dim  - matrix dimension for the spin
dynamics subspace


This function returns the powder average of whatever it is that the pulse sequence returns.

Note: the choice of the rank depends on the spinning rate (the slower the spinning, the greater ranks are required). The rank is appro- ximately equal to the number of spinning sidebands.

Note: the state projector assumes a powder -- single crystal MAS is not currently supported.