 
 
 
 
 
 
 
  
The relativistic KS equations are
Dirac-like equations for a spinor with a ``large'' 
Rnlj(r) and
a ``small'' 
Snlj(r) component:
| c   +   Rnlj(r) | = |  2mc2 - V(r) +   Snlj(r) | (9) | 
| c   -   Snlj(r) | = |  V(r) +   Rnlj(r) | (10) | 
 = - 2(j - l )(j + 1/2) is the Dirac 
quantum number (
 = - 2(j - l )(j + 1/2) is the Dirac 
quantum number ( = - 1 is l = 0,
 = - 1 is l = 0, 
 = - l - 1, l otherwise);
and the charge density is given by
 = - l - 1, l otherwise);
and the charge density is given by
| n(r) =    . | (11) |