Born-Oppenheimer 1927 separation: psi_total = psi_elec(r;R) chi_nuc(R); valid when m_e/M_n -> 0; basis of all molecular electronic-structure theory.
Born-Oppenheimer 1927 separation: psi_total = psi_elec(r;R) chi_nuc(R); valid when m_e/M_n -> 0; basis of all molecular electronic-structure theory.