  The Kepler-Coulomb problem is solved in parabolic coordinates and the Larmor
radiation problem is analyzed to complement a previous study performed for the
usual representation in spherical polar coordinates. A comparison with quantum
spontaneous decay rates shows that for azimuthal quantum number $m = 0$ states
only transitions to nearby $n-\Delta n$ principal quantum number states are
described properly by the Wentzel-Kramers-Brillouin quantized classical
motions, but that for $m > 0$ reasonable results emerge for many values of
$\Delta n$. A simple approximate expression for the lifetime of $m \ne 0$
states emerges from the semi-classical analysis.
