  The fine structure of hydrogen energy was calculated by using the usual
momentum-wavefunction relation directly, rather than establishing the
well-known Dirac wave equation. As the results, the energy levels are
completely the same as that of the Dirac wave equation, while the wavefunction
is single component that is quite different from Dirac's four component
wavefunction, the most important thing is that the present calculation brings
out electronic spin in a new way which has never been reported and indicates
that the electronic spin is a kind of orbital motion.
