Hame is a Python library to compute one-photon and two-photon matrix elements between eigenstates of the hydrogen atom.
It includes diagonal elements of the two-photon matrix elements, that is light-shift and one-photon ionization rate.
It performs the numerical calculation in the length gauge in a Sturmian basis. It additionally performs the calculation in the velocity gauge.
It may check that results in length and velocity gauges are equal.
The full documentation is availablle at https://hame.readthedocs.io