Simple local theory based on the assumption of an important role of Shockley surface states from the vicinity of the Fermi energy in the electron-phonon interaction was used to classify possible reconstructions on the (001) surface of W and Mo. The main conclusion that in-plane deformations (and especially the zig-zag ¯M5 one) were more promising than the buckled deformations compared favourably with the results of most of the existing experimental and theoretical investigations.

On a Qualitative Approach to the W (001) Surface Instability and Reconstruction. M.Tomášek, S.Pick: Czechoslovak Journal of Physics, 1985, 35[7], 768-81