# psycosy.m

From Spinach Documentation Wiki

Alan Kenwright's spatially encoded COSY sequence described in https://doi.org/10.1002/mrc.4727 (Figure 4).

## Syntax

fid=psycosy(spin_system,parameters,H,R,K,G,F)

## Arguments

parameters.sweep sweep width in Hz parameters.npoints number of points for both dimensions parameters.spins nuclei on which the sequence runs, specified as {'1H'}, {'13C'}, etc. parameters.tmix mixing time, seconds parameters.gamp gradient amplitude, T/m parameters.sal_ang flip angle of the saltire chirp (degrees) parameters.sal_dur pulse width of saltire chirp (s) parameters.sal_del chirp pulse gradient duration (s) parameters.sal_swp sweep width of saltire chirp (Hz) parameters.sal_npt number of points in the saltire chirp parameters.sal_smf saltire chirp smoothing factor H Fokker-Planck Hamiltonian, received from the imaging context R Fokker-Planck relaxation superoperator, received from the imaging context K Fokker-Planck kinetics superoperator, received from the imaging context G Fokker-Planck gradient superoperators, received from the imaging context F Fokker-Planck diffusion and flow super- operator, received from the context

## Outputs

fid - two-dimensional free induction decay

## Examples

Several examples may be found in the examples/nmr_spen directory. The PSYCOSY spectrum of salsalate is reproduced below, note that one of the two dimensions is pure shift.

## See also

psyche.m, spencosy.m, spendosy.m, st_ideal.m

*Version 2.4, authors: Alan Kenwright*