Hamiltonian of relative motion

The Hamiltonian of relative motion, on the other hand, is given by... 

The Hamiltonian of relative motion is given by Eq. 5.30. The states i), I/), of this Hamiltonian, Jf, which we will call the initial and final states of a given spectroscopic transition, are associated with eigenenergies Ef. The wavefunctions of relative motion are obtained by introducing spherical coordinates R, 8, (p and the partial wave expansion, according... 

X designates the de Broglie wavelength. The propagator is given by the Hamiltonian of relative motion as... 

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