radial momentum
1.Firstly, with the help of angular momentum coupling theory, the Hamiltonian for multi-electron adorns is rewritten in terms of spherical tensors. The advantage of this form is that the radial, angular and spin parts are separated completely, which makes it easy to calculate the angular matrix elements by means of irreducible tensor.
2.In chapter two, with the help of angular momentum coupling theory, the Hamiltonian for multi-electron atoms is rewritten in form of spherical tensors operators. The advantage of this form is that the radial, angular and spin parts are separated completely, which makes it easy to calculate the angular matrix elements by means of irreducible tensor.
