To Run the espresso calculation, you need:
    First to download the pseudo potential C.pw-mt_fhi.UPF and O.pw-mt_fhi.UPF
    from the Quantum espresso website, and to copy them into your pseudo directory
    of your espresso installation.
    then you run,
    pw.x <co2.scf.in >co2.scf.out
    ph.x <co2.ph.in > co2.ph.out
    dynmat.x <co2.dm.in > co2.dm.out
