&control
    pseudo_dir  = '/srv/local/guest/Desktop/espresso-4.2/pseudo'
    calculation = 'scf',
    prefix = 'Si_exc1',
 /
 &system
    ibrav =  2, 
    celldm(1) = 10.26, 
    nat =  2, 
    ntyp = 1,
    ecutwfc = 20
 /
 &electrons
    mixing_beta = 0.7
 /

ATOMIC_SPECIES
 Si 28.086  Si.pbe-rrkj.UPF

ATOMIC_POSITIONS (alat)
 Si 0.0 0.0 0.0
 Si 0.25 0.25 0.25

K_POINTS (automatic)
  6 6 6 1 1 1