  The geometry-dependent ionization behavior of the ammonia molecule is
investigated. Different theoretical approaches for obtaining the ionization
yield are compared, all of them showing a strong dependence of the ionization
yield on the inversion coordinate at long wavelengths ($\geq$ 800 nm). It is
shown how this effect can be exploited to create and probe nuclear wave packets
in neutral ammonia using Lochfra{\ss}. Furthermore, imaging of a wave packet
tunneling through the barrier of a double-well potential in real time is
discussed.
