# Intrep.m

From Spinach Documentation Wiki

Interaction representation transformation with respect to a specified Hamiltonian to specified order in perturbation theory. Syntax:

Hr=intrep(spin_system,H0,H,T,order)

Parameters:

H0 - the Hamiltonian with respect to which the interaction representation transformation is to be done

H - laboratory frame Hamiltonian H0+H1 that is to be transformed into the interaction rep- resentation

T - period of the H0 propagator

order - perturbation theory order in the rotating frame transformation

*Revision 3250, authors: Ilya Kuprov*