Keywords: user_guide

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## 4.7 Other tools

Code `ppacf.x` computes the coupling constant dependency of the exchange correlation potential Exc, λ, λ∈[0 : 1] and the spatial distribution of the exchange-correlation energy density and kinetic correlation energy density according to: Y. Jiao, E. Schröder, and P. Hyldgaard, Phys. Rev. B 97, 085115 (2018). See `PP/Doc/INPUT_PPACF.html`.

Code `wfck2r.x` converts Kohn-Sham orbitals from reciprocal to real space. It is a useful starting point if you need to access wavefunctions and perform postprocessing operations that are not implemented in QUANTUM ESPRESSO.

Code `epsilon.x` calculates RPA frequency-dependent complex dielectric function. Documentation is in file `Doc/eps_man.tex`.

Code `initial_state.x` calculates the initial state contribution to the Core-level shift. See `CLS_IS_example/` for an example, and `CLS_FS_example/` for the corrsponding final state calculation of Core-level shifts.