	outer shell charge
attribute	fixed, uniform	mobile
$\frac{o u t e r s h e l l m a s s}{e l e c t r o n m a s s} = \frac{o u t e r s h e l l c h a r g e}{e l e c t r o n c h a r g e}$	−156.3	−137.0
$\frac{c e n t r a l c o r e m a s s}{e l e c t r o n m a s s} = \frac{c e n t r a l c o r e c h a r g e}{e l e c t r o n c h a r g e}$	157.3	137.0 + 1.0
$\frac{c e n t r a l c o r e m a s s}{o u t e r s h e l l m a s s} = \frac{c e n t r a l c o r e c h a r g e}{o u t e r s h e l l c h a r g e}$	$- (1 + \frac{1}{156.3})$	$- (1 + \frac{1}{137.0})$
$\frac{1}{f i n e s t r u c t u r e c o n s t a n t}$	137.0	137.0
$\frac{c h a r g e r a d i u s}{c l a s s i c a l e l e c t r o n r a d i u s}$	1.32	1.15
ellipticity	1.012	1.035