# Deer 3p hard deer.m

Three-pulse DEER pulse sequence. Idealized hard pulses are used, each pulse only affects its specific electron. Syntax:

           deer=deer_3p(spin_system,parameters,H,R,K)


where H is the Hamiltonian commutation superoperator, R is the relaxation superoperator and K is the chemical kinetics super- operator. The following parameters are required:

  parameters.rho0            initial state

  parameters.coil_prob       detection state on probe spin

  parameters.stepsize        increment time for the pump pulse
sandwich

  parameters.nsteps          number of steps for the pump pulse
sandwich

  parameters.ex_prob         excitation operators to be used for
parameters.ex_pump         the probe and pump electron respec-
tively -- hard pulses are only app-
ropriate for spin-1/2 systems, for
higher spin systems transition se-
lective operators must be supplied.

  parameters.output          'brief' returns just the DEER trace,
'detailed' also returns excitation
profiles and the EPR spectrum.


If 'detailed' is selected as the output option, the following para- meters are also required:

  parameters.ex_hard          hard pulse excitation operator

  parameters.spectrum_sweep   sweep width of the EPR spectrum, Hz

  parameters.spectrum_nsteps  number of time steps in the FID

  parameters.coil_pump        detection state on pump spin