My 2 cents to this: Not a particularly meaningful question.

`The only meaningful thing about energies, as in eigenvalues of the`

`Hamiltonian, is their DIFFERENCE. The evolution with time of the state`

`of an isokated quantum system (Schrödinger picture) is completely`

`governed by the differences of the eigenvalues of the Hamiltonian. The`

`choice of where you put zero is up to you.`

`A common choice for zero is the ground state energy of the Hamiltonian.`

`In this case clearly zero is zero, there is no effect of SO.`

`Other choices are more practical in various circumstances: The mean of`

`the spektrum of the Hamiltonian, or the Fermi energy (definition`

`discussed recently here), or some fictitious reference limit like the`

`state with all charges at infinite distance ... The ground state energy`

`then probably will depend on whether or not you put SO into your`

`Hamiltonian. After all you consider SO because it changes energy`

`differences and might split degeneracies.`

--- Dr. Martin Pieper Karl-Franzens University Institute of Physics Universitätsplatz 5 A-8010 Graz Austria Tel.: +43-(0)316-380-8564 Am 29.10.2016 23:20, schrieb Abderrahmane Reggad:

Hello again I am waiting for an answer to my question . My question is about the effect of the inclusion of the Spin-Orbit Coupling on the ground state energy. I want to know if the SO affect the ground state energy also or It only causes the splitting of the degenerate state energies. Any information will be fruitful for me. I hope find an answer to my question -- Mr: A.Reggad Laboratoire de Génie Physique Université Ibn Khaldoun - Tiaret Algerie _______________________________________________ Wien mailing list Wien@zeus.theochem.tuwien.ac.at http://zeus.theochem.tuwien.ac.at/mailman/listinfo/wien SEARCH the MAILING-LIST at: http://www.mail-archive.com/wien@zeus.theochem.tuwien.ac.at/index.html

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