Development of ultra violet photoemission [UPS]: a history

UPS of solids investigations are summarized from the late 1940's through the very early 1960's which measured kinetic energy distributions [ EDC's ] of the emitted electrons. The experiments contributed to the opening of the photoemission spectroscopy fields. This era involved activities at G. E. Research Labs, Univ. of Missouri and W. E. Spicer's lab. The author knew most of the researchers.