The Lamb-shift polarimeter (LSP) is a useful detection apparatus to verify nuclear spin polarization for atoms, molecules and ions consisting of hydrogen and/or its isotopes. Its functionality
relies on the creation of metastable hydrogen atoms via a charge exchange reaction that preserves
the nuclear polarization in a strong magnetic field. The nuclear polarization is then determined
by analyzing the relative occupation numbers between different metastable hyperfine states with
different nuclear spin projection $m_I$. This makes the LSP a very rapid and cost efficient detection
method for beams with a beam energy in the keV range as no pre-acceleration is needed. In
the past it was shown that many of the above mentioned candidates like $H^{+}$, $D^+$, $HD$ etc.
could be measured with success, and in this work an additional ion, i.e. $H^{-}$, adds up to the list.
Furthermore, the measurements of polarized $H^{-}$ ions have been performed for pulsed beams as it
was in use for long times at the cooler synchrotron COSY in Jülich. In the second part, a theoretical
outlook for possible adaptations to the spin filter is given, which is an important component of
the LSP. This paves the way to realize experiments investigating the bound beta decay or parity violation
in metastable hydrogen atoms. In addition, a short outlook for possible applications of $^{3}He$
beams is given.