The influence of relativity on the spectroscopic parameters of Cu2 has been investigated by evaluating the mass-velocity and one electron Darwin terms of the Breit–Pauli Hamiltonian in the first order of perturbation theory. The relativistic corrections are of the order of 10% of the SCF and GVB results and result in a deeper (∼1.5 kcal), stiffer (∼15 cm−1) well, with the bond length contracted by about 0.1a0. (AIP)
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Richard L. Martin (1983) studied this question.
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