homospoil.m

Emulates a strong homospoil pulse - only zero-frequency states with respect to the carrier frequencies (chemical shifts are not considered) survive the process.

Syntax

rho=homospoil(spin_system,rho,zqc_flag)

Arguments

rho - a state vector or a horizontal stack thereof

   zqc_flag - a flag controlling the fate of zero-quantum
              coherences. If set to 'keep', causes ZQCs to
              survive the process, approximating experimen-
              tal behaviour. If set to 'destroy', wipes the
              zero-quantum coherences - only the longitudi-
              nal states survive the process.

              The flag is ignored in zeeman-hilb and zeeman-
              liouv formalisms, where the effect is always
              to destroy everything except the diagonal of
              the density matrix.

Outputs

rho - the state vector(s) with only the longitudi-

              nal or only the zero-quantum states kept

Note: this function is only available for sphten-liouv formalism; it
      supports Fokker-Planck direct products.

Note: this is a purely mathematical filter that only mimics - in an
      idealised way - the effect of a real homospoil pulse. Essenti-
      ally, it searches the density matrix for any transverse state
      populations and zeroes them out. If the flag is set, zero-qua-
      ntum coherences are also erased.

ilya.kuprov@weizmann.ac.il

Notes

This function is only available for sphten-liouv formalism; it supports Fokker-Planck direct products.

See also

Coherence order selection

State space indexing and manipulation

Version 2.8, authors: Ilya Kuprov