Fig. 1. Surface structure of W (100): (a) Crystal lattice; (b) reciprocal lattice.

Fig. 2. Surface phonon spectrum of W(100)

Fig. 3. Surface mode distribution of W(100).

Fig. 4. Comparison of calculated S₁ surface mode and experimental value.

Fig. 5. Local vibrational state density of atomic layers in the vicinity of the W (100) surface along symmetry direction: (a) First atomic layer; (b) second atomic layer; (c) third atomic layer; (d) fourth atomic layer.

Fig. 6. Polarizing state density of atomic layers in the vicinity of the W (100) surface along symmetry direction: (a) x polarization for first atomic layer; (b) y polarization for first atomic layer; (c) z polarization for first atomic layer; (d) x polarization for second atomic layer; (e) y polarization for second atomic layer; (f) z polarization for second atomic layer.

Fig. 7. Local vibrational state density of atomic layers in the vicinity of the W (100) surface along symmetry direction: (a) First atomic layer; (b) second atomic layer; (c) third atomic layer; (d) fourth atomic layer.

Fig. 8. Polarizing state density of atomic layers in the vicinity of the W (100) surface along symmetry direction: (a) x polarization for first atomic layer; (b) y polarization for first atomic layer; (c) z polarization for first atomic layer; (d) x polarization for second atomic layer; (e) y polarization for second atomic layer; (f) z polarization for second atomic layer.

Fig. 9. Local vibration state density of atomic layers in the vicinity of the W (100) surface along symmetry direction: (a) First atomic layer; (b) second atomic layer.

Fig. 10. Polarizing state density of atomic layers in the vicinity of the W (100) surface along symmetry direction: (a) x polarization for first atomic layer; (b) y polarization for first atomic layer; (c) z polarization for first atomic layer; (d) x polarization for second atomic layer; (e) y polarization for second atomic layer; (f) z polarization for second atomic layer.