We have studied the surface state of Cu(111) using an ellipsoidal-mirr
or analyzer which gives two dimensional images of photoelectron intens
ity versus emission angle. By combining these images, we have obtained
the surface-state dispersion in three dimensional E versus k space. W
e have also studied the bulk Fermi surface of Cu(100). Our results are
in excellent agreement with previous studies and provide a new perspe
ctive on studies of surface electronic structure.