  We derive expressions for the lossy boundary-scattering contribution to the
linewidth of surface electronic states confined with atomic corrals and island
resonators. Correcting experimentally measured linewidths for these
contributions along with thermal and intrumental broadening enables intrinsic
many-body lifetimes due to electron-electron and electron-phonon scattering to
be determined. In small resonators lossy-scattering dominates linewidths whilst
different scaling of widths and separations cause levels to merge in large
resonators. Our results enable the design of resonators suitable for lifetime
studies.

Other Condensed Matter;Materials Science