Bethe 1929 + Van Vleck 1932: octahedral d-orbital splitting Delta_o between t2g + eg; high-spin vs low-spin governed by Delta_o vs P pairing energy; spectrochemical series ordering.
Bethe 1929 + Van Vleck 1932: octahedral d-orbital splitting Delta_o between t2g + eg; high-spin vs low-spin governed by Delta_o vs P pairing energy; spectrochemical series ordering.