deer_3p_soft_hole.m

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Pulse diagnostics for the three-pulse DEER/PELDOR pulse sequence. This function shows how soft pulses affect the magnetisation of the sample. It is a hypothetical experiment where a soft pulse specified by the user is performed, immediately followed by an ideal pi/2 pulse on all spins followed by infinite-bandwidth time-domain detection.

Syntax

    fids=deer_3p_soft_hole(spin_system,parameters,H,R,K)

Arguments

     parameters.pulse_frq  - frequencies for the three 
                             pulses, Hz

     parameters.pulse_pwr  - power levels for the three
                             pulses, rad/s

     parameters.pulse_dur  - durations for the three
                             pulses, seconds

     parameters.pulse_phi  - initial phases for the three 
                             pulses, radians

     parameters.pulse_rnk  - Fokker-Planck ranks for the
                             three pulses

     parameters.offset     - receiver offset for the time
                             domain detection, Hz

     parameters.sweep      - sweep width for time domain
                             detection, Hz

     parameters.npoints    - number of points in the free
                             induction decay 

     parameters.rho0       - initial state

     parameters.coil       - detection state

     parameters.method     - soft puse propagation method,
                             'expv' for Krylov propagation,
                             'expm' for exponential propa-
                             gation, 'evolution' for Spin-
                             ach evolution function

   H  - Hamiltonian matrix, received from context function

   R  - relaxation superoperator, received from context function

   K  - kinetics superoperator, received from context function

Outputs

   fids  - three free induction decays that should be apo-
           dised and Fourier transformed

Examples

A good case is the first figure produced by examples/esr_solids/soft_3_pulse_deer_2e.m example file, reproduced below.

Pulse effect.png

Notes

For the method, start with 'expm', change to 'expv' if the calculation runs out of memory, and use 'evolution' as the last resort.

See also

deer_3p_hard_echo.m, deer_3p_hard_deer.m, deer_analyt.m, eseem.m, oopeseem.m, deer_4p_soft_deer.m, deer_4p_soft_hole.m, deer_4p_soft_diag.m, deer_3p_soft_deer.m, deer_3p_soft_diag.m


Version 2.4, authors: Ilya Kuprov