A smectogenic 1,3-bis(4-decyloxyphenyl)-3H-imidazol-1-ium trifluoromethane sulfonates (1) was studied on the drift mobility of carriers by a Time-Of-Flight (TOF) technique. The transient photocurrent decay curves were clearly observed for the positive electrode illumination and the transit times could be detected to indicate the mobility in the smectic A (SmA) phase is on the order of 10(-3) cm(2) V-1 s(-1). This carrier mobility is too fast if it is a reflection of ionic transport in this system and is more easily explained on the basis of electronic charge hopping process.