A compilation of different parametrizations for the electronic stopping of ions in matter:

• SRIM version 1996, obtained from published source code
• SRIM version 2013, obtained from the SR_module.exe utility included in the SRIM distribution
• DPASS version 21.06, from the DPASS.exe utility included in the DPASS distribution

The electronic stopping cross-section $S_e$, in units of $10^{-15}$ eV-cm$^2$, is tabulated over a logarithic energy range from $1$ to $10^6$ keV/u, for $92 \times 92$ ion-target combinations and for all three parametrizations listed above.

The tables are compiled as a plain C shared library (.so or .dll) to facilitate integration into other software.

The library can be built and installed with cmake. This is done with the following commands (run from the project directory):

mkdir build
cd build
cmake .. -DCMAKE_BUILD_TYPE=Release
ninja  # or make, nmake etc
ninja install

On Linux the default install location is $HOME/.local, thus sudo is not required. On Windows the files to be installed are copied into the folder build/libdedx. Override the install behavior by setting the option -DCMAKE_INSTALL_PREFIX="/your/install/location" when calling cmake.

The following code shows how to use the library in a C or C++ program.

#include <libdedx.h>

int model = SM_SRIM13;
const float *E, *Se;
int n;
int Z1 = 1; // H projectile
int Z2 = 26; // Fe target

stopping_xs(model, Z1, Z2, &E, &Se, &n);

for(int i=0; i<n; i++) x = Se[i] ...

The type of parametrization is selected by the int variable model which can take up one of the predefined values SM_SRIM96, SM_SRIM13, DPASS22.

Z1 and Z2 are the atomic numbers of projectile and target, respectively.

The function stopping_xs takes these parameters as input and returns pointers to arrays of the corresponding energy (in keV/u) and stopping cross-section values (in eV=cm$^2$). The number of array elements is returned in n.

The folder src/generator contains source code for building the generator executable. This can be used to generate automatically the data files for building the libdedx library.

The files have already been generated and are included in src/generated.

generate.sh is an example script showing how to run the generator app.