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Microstates and Terms

! In any microstate both the individual orbital magnetic moments (related to ml)  and spin magnetic moments (related to ms) will interact with one another, resulting in an energy state or term for the configuration.
! Except for a fully filled configuration, no one microstate uniquely gives rise to a particular energy for the configuration.
! A number of microstates generally contribute to a single term.
! Terms are usually degenerate according to the number of microstates giving rise to them.
! In a ligand field, degeneracies among all the microstates comprising a particular free-ion term may be partially lifted.
The various terms that can exist for a particular configuration are indicated by a term symbol of the form
                                                        2S + 1
                                                                    L
" L is related to the overall orbital angular momentum for the system of electrons. 
Values of L may be 0, 1, 2, ...
" S is related to the overall spin angular momentum for the system of electrons.
Values of S may be 0, 1/2, 1, 3/2, ...
" L and S are analogous to the quantum numbers l and s for single
electrons. 
The left superscript number 2S + 1 is the multiplicity of the term.
author

DESH DEEPAK A P S CHAUHAN

M.Sc. CHEMISTRY!

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