Dominance of correlation and relativistic effects on photodetachment time delay well above threshold

Wigner time delay in photodetachment from the 3p3/2 and 3p1/2 subshells of Cl- has been studied in the vicinity of the 2p3/2 and 2p1/2 thresholds, using the relativistic random phase approximation (RRPA). The results show time delay spectra dominated by many-body correlations along with very complicated dependence on the energy over a broad spectral range. In addition, the time delay spectra of the two spin-orbit split 3p subshells differ significantly from one another, thereby revealing the importance of relativistic effects even in the case of a low-Z system.