Fine Details of the Electronic Excitations in the Near-Nodal Region of the Fermi Surface in Bi 2212

Recent high resolution ARPES experiments on high quality Bi$_2 $Sr$_2$CaCu$_2$O$_{8+\delta}$ samples have uncovered extremely coherent excitations in the near-nodal region of the Fermi surface. The width of these excitations at low energies and at low temperature seems to be essentially resolution limited. This observation has enabled a more detailed insight into the intrinsic properties of these excitations. Some of the ``fine features" that have not been previously resolved, will be discussed. This work was supported by the DOE under contract number DE- AC02-98CH10886.