This paper reports the results of studies on chargedN1centers, produced using a technique in which additively colored KCl and KBr crystals are exposed to near ultraviolet excitation at low temperatures. In undoped crystals, absorption and emission data are presented showing several new chargedN1transitions along with information relating to the nature of the defects. In addition, this work demonstrates that in sodium‐doped crystals,N1centers can be ionized through electron transfer toFAcenters. This technique has already been used in stabilizing (F+2)Acenters in laser‐active crystals and may have future application for lasing ionizedN1centers.