Deer 3p hard echo.m

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Samples the spin echo in the three-pulse DEER experiment for the purposes of determining its precise location. This is necessary in high-spin elec- tron systems for which the echo might not be in the expected place.

                echo=deer_echo(spin_system,parameters,H,R,K)

Parameters:

     parameters.ex_prob   - probe pulse operator
     parameters.ex_pump   - pump pulse operator
     parameters.ta        - time between first and third pulse
     parameters.tb        - time between first and second pulse
     parameters.tc        - time interval to sample around the echo
     parameters.rho0      - initial condition
     parameters.nsteps    - number of sampling steps in tc interval
     parameters.coil      - detection state

Note: always run this experiment before simulating DEER traces. DEER spin echo can be very narrow and easy to miss.