Samples the spin echo in the three-pulse DEER experiment to determine its precise location - DEER spin echo can be narrow and easy to miss. For high-spin electrons the echo may not be in the expected place. Idealized hard pulses are used, each pulse only affects its specific electron or transition, depending on the pulse operators supplied.
parameters.ex_prob - probe pulse operator parameters.ex_pump - pump pulse operator parameters.ta - time between first and third pulse, s parameters.tb - time between first and second pulse, s parameters.tc - time interval to sample around the echo, s parameters.rho0 - initial condition parameters.nsteps - number of sampling steps in the tc interval parameters.coil - detection state H - Hamiltonian matrix, received from context function R - relaxation superoperator, received from context function K - kinetics superoperator, received from context function
echo - the signal detected during the parameters.tc interval with parameters.nsteps points in it
The echoes for DEER experiments with a two Cu(II) ions (top, examples/esr_solids/hard_3_pulse_echo_cu.m) and two Gd(III) ions (bottom, examples/esr_solids/hard_3_pulse_echo_gd.m) are shown below.