# acquire.m

From Spinach Documentation Wiki

Forward time evolution with signal acquisition. The function propagates the initial condition forward in time and returnes the dynamics of the projection of the densty matrix onto the specified detection state. This function should notmally be called from inside a context function.

## Contents

## Syntax

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

## Parameters

parameters.sweep sweep width, Hz parameters.npoints number of points in the FID parameters.rho0 initial state parameters.coil detection state parameters.decouple spins to decouple, e.g. {'15N','13C'} parameters.homodec_oper operator to add to the Liouvillian at the detection stage (optional) parameters.homodec_pwr power coefficient for the operator, Hz parameters.dead_time the system will be evolved for this time (seconds) before the signal acquisition begins (optional) H - Hamiltonian matrix, received from context function R - relaxation superoperator, received from context function K - kinetics superoperator, received from context function

## Outputs

fid - time dynamics of the detection state

## Examples

The following NMR spectrum is returned by examples/nmr_liquids/pa_rotenone.m function. The corresponding free induction decay is simulated by specifying L+ as the initial condition and then calling acquire().

## Notes

This function may be used to save time in pulse-acquire experiment simultaions by giving it the analytical result of the pulse as the initial condition.

## See also

slowpass.m, hp_acquire.m, sp_acquire.m, fieldsweep.m

*Version 2.2, authors: Ilya Kuprov, Luke Edwards*