, we obtain therefore a set of stationary states corresponding to values of
from
to
. Instead of the simple formula (5) Sommerfeld found a more complicated expression for the energy in the stationary states which depends on
as well as
, we obtain therefore a set of stationary states corresponding to values of
from
to
. Instead of the simple formula (5) Sommerfeld found a more complicated expression for the energy in the stationary states which depends on
as well as