  Through a combined experimental and theoretical approach, we study the
nonadiabatic dynamics of the prototypical ethylene (C$_2$H$_4$) molecule upon
$\pi \rightarrow \pi^*$ excitation with 161 nm light. Using a novel
experimental apparatus, we combine femtosecond pulses of vacuum ultraviolet
(VUV) and extreme ultraviolet (XUV) radiation with variable delay to perform
time resolved photo-ion fragment spectroscopy. In this second part of a two
part series, the extreme ultraviolet (17 eV$ < h \nu < 23$ eV) probe pulses are
sufficiently energetic to break the C-C bond in photoionization, or photoionize
the dissociation products of the vibrationally hot ground state. The
experimental data is directly compared to ab initio molecular dynamics
simulations accounting for both the pump and probe steps. Enhancements of the
CH$_2^+$ and CH$_3^+$ photoion fragment yields, corresponding to molecules
photoionized in ethylene (CH$_2$CH$_2$) and ethylidene (CH$_3$CH) like
geometries are observed within 100 fs after $\pi \rightarrow \pi^*$ excitation.
Quantitative agreement between theory and experiment on the relative CH$_2^+$
and CH$_3^+$ yields provides experimental confirmation of the theoretical
prediction of two distinct transition states and their branching ratio (Tao, et
al. J. Phys. Chem. A. 113, 13656 (2009)). Fast, non-statistical, elimination of
H$_2$ molecules and H atoms is observed in the time resolved H$_2^+$ and H$^+$
signals.
