Angle-resolved photoemission measurements using synchrotron radiation have been made on a UIr3(100) face. With the use of the Fano resonance at the 5d absorption edge, the 5f emission was extracted and found to agree well with a calculated 5f density of states. Dispersion was observed for the first time in a photoemission peak clearly associated with 5f emission. The dispersion is generally in good agreement with calculated energy bands. © 1983 The American Physical Society.