## Photoionisation cross-sections

The basic process is inner shell photo-ionisation: $\left(n_cl_c\right)^q nl + \gamma \rightarrow \left(n_cl_c\right)^{q-1}nl + {\rm e}$

A separate file is provided for each n shell. Separate files are given for term (LS) coupling and intermediate (IC) coupling. Outer shell photo-ionisation is included for completeness. Where inner shell photo-ionisation is present, the atomic structure is optimised for the inner-shell processses.