2-DIMENSIONAL ANALYSIS OF POSITRON AGE-MOMENTUM CORRELATION (AMOC) DATA

By measuring the individual positron lifetimes (= positron ages) toget her with the energies of one of the annihilation quanta in a triple-co incidence set-up (age-momentum correlation, AMOC), time-resolved infor mation on the evolution of the positron states may be obtained, The pr esent paper describes a data evaluation procedure that makes full use of the time-resolved information provided by the AMOC relief(number of counts versus positron age and photon energy) by fitting the paramete rs of an appropriate physical model directly to the two-dimensional re lief without prior data reduction, The power of this novel analysis is illustrated by analyzing complex formation and spin conversion of pos itronium in solutions of HTEMPO in solid and liquid benzene.