Results one+transmission reemission properties are presented for three single‐crystal W(100) films of thicknesses 1000, 2000, and 3100 A˚ for incidente+energies of 1.4–16 keV. The films were first cleaned with a 10‐s laser pulse, then annealed in O2(10−6Torr), and finally heated in a vacuum (10−9Torr). Thereafter the films showed good reemission properties. The maximum transmitted yields of slowe+were 38% (1000 A˚), 27% (2000 A˚), and 17% (3100 A˚) at incidente+energies of 4, 5.2, and 7.2 keV, respectively. The energy distributions of the reemittede+were characterized by a full width half maximum of 0.15–0.2 eV located at 2.8 eV containing 60%–70% of thee+superimposed onto a nearly uniform distribution covering the energy interval 0–2.8 eV.