The natural units of length and energy to be used are the effective Bohr radius a*B = Kh2/m*ee2 and effective Rydberg R* = h2/2m*ea*B. The dimensionless constant y = hwc/2Ry plays the role of an effective magnetic field strength.

Upon introducing the center of mass R = (r1 + r2)/v/2 and the relative coordinates r = (r1 — r2)/\/2, the Hamil-tonian [180] in Eq. (316) can be written as a sum of two separable parts that represent the center of mass motion Hamiltonian, h2

and the relative motion Hamiltonian, h hac

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