Rotframe.m

Rotating frame transformation with respect to specified spins to specified order in perturbation theory (https://doi.org/10.1063/1.4928978).

Syntax

    Hr=rotframe(spin_system,H0,H,isotope,order)

Arguments

   H0     - carrier Hamiltonian with respect to which the
            rotating frame transformation is to be done
 
   H      - laboratory frame Hamiltonian H0+H1 that is to
            be transformed into the rotating frame 
 
   isotope - string, such as '1H', specifying the spins
             with respect to which the transformation is
             being computed
 
   order   - perturbation theory order in the rotating
             frame transformation, this may be inf

Outputs

   H       - rotating frame Hamiltonian

Notes

The auxiliary matrix method is massively faster than either commutator series or diagonalisation.

See also

intrep.m, average.m, dirdiff.m, propagator.m, equilibrium.m

Version 2.2, authors: Ilya Kuprov