  In this article, we report on the development of a time-of-flight based
electron energy analyzer capable of measuring the 3-D momentum and energy
distributions of very low energy (meV-scale) photoemitted electrons. This
analyzer is capable of measuring energy and 3-D momentum distributions of
electrons with energies down to 1 meV with a sub-meV energy resolution. This
analyzer is an ideal tool for studying photoemission processes very close to
the photoemission threshold and also for studying the physics of photoemission
based electron sources.
