Neodymium Ionization Energy

The Neodymium Ionization Energy is the energy required to remove from atom one mole of electrons with subsequent production of positively charged ion of Neodymium.
Nd -> Nd⁺ + e^-
This process can be repeated many times, but the energy cost is increased dramatically. The general equation for the Neodymium is:
Nd^N+ -> Nd^(N+1)+ + e^-

Nd -> Nd¹⁺ = 529.6 kJ/mol = 126.70 Kcal/mol
Nd¹⁺ -> Nd²⁺ = 1035 kJ/mol = 247.61 Kcal/mol
Nd²⁺ -> Nd³⁺ = 2130 kJ/mol = 509.57 Kcal/mol
Nd³⁺ -> Nd⁴⁺ = 3899 kJ/mol = 932.78 Kcal/mol