  We study the excitation redistribution from cesium $7\mathrm{P}_{1/2}$ or
$7\mathrm{P}_{3/2}$ to neighboring energy levels by Black Body Radiation (BBR)
and inter atomic collisions using pump-probe spectroscopy inside a vapor cell.
At low vapor densities we measure redistribution of the initial,
velocity-selected, atomic excitation by BBR. This preserves the selected atomic
velocities allowing us to perform high resolution spectroscopy of the
$\mathrm{6D\rightarrow 7F}$ transitions. This transfer mechanism could also be
used to perform sub-Doppler spectroscopy of the cesium highly-excited
$\mathrm{nG}$ levels. At high densities we observe interatomic collisions
redistributing the excitation within the cesium $\mathrm{7P}$ fine and
hyperfine structure. We show that $\mathrm{7P}$ redistribution involves
state-changing collisions that preserve the initial selection of atomic
velocities. These redistribution mechanisms can be of importance for
experiments probing high lying excited states in dense alkali vapor.
