their emission angle and their kinetic energies. From the photoelectron
kinetic energy, the binding energy is determined as an energy difference
from the Fermi energy. The internal wave vector of the
photoelectron has also to be determined to test the calculated
electron energy dispersion.
A series of angle resolved photoemission spectra of a Mo(001) single
crystal surface.
The Mo(001) surface is known to show surface reconstruction
from a (1x1) to an incommensurate c(2.2x2.2) phase upon cooling
below Tc=230K.
By analyzing the photoelectron spectra, changes in the electronic structure,
which are related to the surface reconstruction, could be measured.
The photoelectron spectra in the figure were collected at T=52K
and with KII along the surface
S axis.
The spectra consist of surface states(S1),
surface resonance states(SR1, SR2) and bulk
valence band states(B1).
Two-dimensional Fermi-surface contours can be obtained
by determining the Fermi wave vector
kII(EF) at which S1
crosses the Fermi level.