Attosecond Time Delay Trends across the Isoelectronic Noble Gas Sequence

The relationship between negatively charged halogens and their nobel gas counterparts has been of considerable interest to the study of attosecond time delays as it is well known that experimental time delay measurements are the sum of two separate delay components, with the first being the Wigner delay and the second being the coulomb laser-coupling delay. The study of negative halogens provides the experimental benefit of eliminating the coulomb laser-coupling delay, therby allowing direct measurements of an absolute Wigner time delay. Many experimental and theoretical analyses have been made regarding photoionization time delays in nobel gases, but very little literature has been published on photodetachment time delays in halogen atoms until recently. In this work, Relativistic Random Phase Approximation (RRPA) time delay calculations were performed for the negative ions Cl^-, Br^-, I^- and compared to the nobel gases Ar, Kr, and Xe.