Keywords: user_guide

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# 3 Compilation

`PWneb` is a package tightly bound to QUANTUM ESPRESSO. For instruction on how to download and compile QUANTUM ESPRESSO, please refer to the general Users' Guide, available in file `Doc/user_guide.pdf` under the main QUANTUM ESPRESSO directory, or in web site `http://www.quantum-espresso.org`.

Once QUANTUM ESPRESSO is correctly configured, `PWneb` can be automatically downloaded, unpacked and compiled by just typing `make neb`, from the main QUANTUM ESPRESSO directory. `make neb` will produce the following codes in `NEB/src`:

- `neb.x`: calculates reaction barriers and pathways using NEB.
- `path_interpolation.x`: generates a reaction path (a set of points in the configuration space of the atomic system, called ``images''), by interpolating the supplied path. The new path can have a different number of images than the old one and the initial and final images of the new path can differ from the original ones. The utility `path_interpolation.sh` in the `tools/` directory shows how to use the code.

Symlinks to executable programs will be placed in the `bin/` subdirectory of the main QUANTUM ESPRESSO directory.

Subsections

- 3.1 Running examples