epraya.Mfieldframe

Mfieldframe(vectors, direction, Sval, Ival, dimerq, Kroexpand)

Pass the eigenvectos to the basis quantized along the static field direction for multi systems. Pass from the molecular frame to the field frame to define the high field labels (|ms_N,mi_N>), assuming the basis refer to the z axis of the molecular frame. To make the rotation uses the Euler-Rodrigues formula with exp(-theta u·(S+I))