  We review recent work on the photoionization of atomic ions of astrophysical
interest that has been carried out at the photon-ion merged-beams setup PIPE, a
permanently installed end station at the XUV beamline P04 of the PETRAIII
synchrotron radiation source operated by DESY in Hamburg, Germany. Our results
on single and multiple L-shell photoionization of Fe+, Fe2+, and Fe3+ ions and
on single and multiple K-shell photoionization of C-, C+, C4+, Ne+, and Si2+
ions are discussed in astrophysical contexts. Moreover, these experimental
results bear witness of the fact, that the implementation of the photon-ion
merged-beams method at one of the world's brightest synchrotron light sources
has led to a breakthrough for the experimental study of atomic inner-shell
photoionization processes with ions.
