Purpose of pw2gw.x: Optical properties in single-particle approach (Fermi Golden Rule). Interface with GW and excitonic codes. The code computes and writes ("matrixelements" file) the optical matrix elemenents in the dipole approximation. The code computes the imaginary part of the dielectric tensor xx, yy and zz ("epsX.dat", "epsY.dat", "epsZ.dat") and the average ("epsTOT.dat") Structure of the input data: ============================ &INPUTPP ... / MANDATORY the first part of the name of all the file written by the code should be equal to the value given in the main calculations. "./" the scratch directory where the massive data-files are written "gw" "gw" : Calculate dipole optical matrix elements (use for norm-conserving pseudopotentials) and imaginary part of the dielectric function. "gmaps": write g-maps for each processor in a file "fort.'100 + processor number'" .FALSE. if .TRUE. write the interface file "QPLDA" to GW and BSE codes (chisig, dpforexc). .FALSE. if .TRUE. calculates the expectation value of the exchange and correlation potential on all the Kohn-Sham states and write it into the "vxcdiag.dat" file. .FALSE. if .TRUE. use Kleyman-Bylander projectors to write additional informatio into fort.15 file (Still in development) 0.0 Starting photon energy for which the dielectric function is calculated (in eV) 30.0 Highest photon energy for which the dielectric function is calculated (in eV) 0.05 Energy step with which the dielectric function is calculated (in eV)