This voLume continues the description of the physicaL properties of
tungsten metaL and covers specificaLLy surface properties, eLectron
emission, and fieLd evaporation. Tungsten surfaces are probabLy the most
extensiveLy studied metaL surfaces. RecentLy, experimentaLists and
theorists have focused their interest on the atomic structure, Lattice
dynamics, and eLectronic properties of the W(100) surface. WhiLe the
structure of the recon- structed Low-temperature surface is weLL
estabLished, there are still unresoLved probLems concerning the
structure at and above room temperature, the nature of the phase
transition, and the driving force for the reconstruction. Other
Low-index tungsten surfaces have been studied in much Less detail. There
are numerous and partLy confLicting data on the surface energy, the
seit-diffusion parameters, and the work function of singLe-crystaL and
poLycrystaL tungsten surfaces. ELec- tron emission, which is of
fundamentaL importance for many appLications, comprises therm- ionic,
fieLd, photofieLd, and photoeLectric emission as weLL as emission
induced by impinging eLectrons, atoms, or ions. Pioneering work in areas
Like thermionic or fieLd emission is comprehensiveLy discussed. Very
recent studies of vaLence-band and core-LeveL spectra moreover provide
detaiLed information on intrinsic surface properties. FieLd evaporation
phenomena are treated at the end of this voLume. Frankfurt am Main
Woltgang HuisL November 1993 fable of Contents Page 1 Atomic Structure,
LaHice Dynamies, and Electronic Structure of Tungsten Surfaces 1 1.1
W(100) . . . . . . . . . . . . . . . . . . . 1.1.1 Atomic Structure.
Reconstruction and Relaxation Survey ................. .