Hex
scattering database
“Hex” stands for “Hydrogen-electron collisions”.
This acronym actually covers several distinct things:
A low-energy code that solves the full
Schrödinger equation in the scattering form for two electrons
in the proton field. The boundary conditions are avoided
using the method of exterior complex scaling.
The current source code of the programs can be freely downloaded at
the Hex project page at SourceForge
and also here: source, win64 binaries.
The package is maintained by the Institute of Theoretical Physics at the
Charles University in Prague, Czech Republic, in the collaboration with
the Astronomical Institute of the Czech Academy of Sciences.