A new TDPAC spectrometer which is based on the principle of event by event
data acquisition (list mode) in order to reduce a background, avoid systema
tic errors and increase efficiency of the setup is described. The principal
demand on the new spectrometer is the simultaneous measurement of all even
ts containing the time and energy signals of the four detectors appearing i
n a preset common time window. For this purpose an 8-parameter list mode da
ta acquisition system has been developed.