Tk. Mukherjee et Pk. Mukherjee, VARIATIONAL EQUATION OF STATES OF ARBITRARY ANGULAR-MOMENTUM FOR 2-PARTICLE SYSTEMS, Physical review. A, 50(1), 1994, pp. 850-853
Work on the reduction of independent variables in the Schrodinger equa
tion for two-particle systems from six to three is extended to give a
closed expression of the variational equation for states of arbitrary
total angular momentum. The method consists of writing the Hamiltonian
in six coordinates, by a suitable choice of transformation equations,
and evaluating integrals involving real angular-momentum functions. A
n existing variational equation for P states follows as a special case
of the present formalism