  Small-angle correlations of pairs of nonidentical light charged particles
produced in central collisions of heavy ions in the A=100 mass region at a beam
energy of 400 AMeV are investigated with the FOPI detector system at GSI
Darmstadt. The difference of longitudinal correlation functions with the
relative velocity parallel and anti-parallel to the center-of-mass velocity of
the pair in the central source frame is studied. This method allows extracting
the apparent space-time differences of the emission of the charged particles.
Comparing the correlations with results of a final-state interaction model
delivers quantitative estimates of these asymmetries. Time delays as short as 1
fm/c or - alternatively - source radius differences of a few tenth fm are
resolved. The strong collective expansion of the participant zone introduces
not only an apparent reduction of the source radius but also a modification of
the emission times. After correcting for both effects a complete sequence of
space-time emission points of p, d, t, 3He, alpha particles is presented for
the first time.
