What is crystal field stabilization energy (CFSE) ?

Explanation

The crystal field stabilisation energy is definedas the energy difference of electronic configurations in the ligand field ` (E_(LF))` and the isotropic field ` (E_(iso ) ) `
CFSE `(Delta E_0) ={E_(LF) }- {E_(iso )}= {[n_(t_(2g))(-0.4)+ n_(c_g) (0.6) [Delta _0+n_pP}-{n'_PP}`
Here ` n_(t_(2g))` is number of electron in ` t_(2g) ` orbitals ,` n_(e_g) ` is number of electrons in ` e_g` orbitals,`n_p` is number of electron pairs in the ligand field ,& `n'_p` is the number of electron pairs in the isotropic field