Attosecond time delay in the photoionization of Mn in the region of the $3p \rightarrow 3d$ giant resonance

TL;DR

This paper investigates attosecond time delays in Mn photoionization near the $3p o 3d$ giant resonance, revealing how autoionization resonances influence time delays and their sensitivity to ionic states, with implications for other transition metals.

Contribution

It introduces a theoretical analysis of photoionization time delays in Mn using the spin-polarized RPAE, highlighting the resonance effects and sensitivity to ionic states, which is novel in this context.

Findings

Giant autoionization resonance significantly affects photoemission time delays.

Time delay in the resonance region correlates with resonance lifetime.

Photoionization time delays are sensitive to the ionic final state.

Abstract

The initial insight into time delay in Mn photoionization in the region of the $3p \to 3d$ giant autoionization resonance is gained in the framework of the "spin-polarized" random phase approximation with exchange. The dramatic effect of the giant autoionization resonance on time delay of photoemission from the $3d$ and $4s$ valence subshells of the Mn atom is unraveled. Strong sensitivity of the time delay of the $4s$ photoemission to the final-state term of the ion-remainder [${\rm Mn^{+}}(4s^{1},$$^{5}S)$ vs.~${\rm Mn^{+}}(4s^{1},$$^{7}S)$] is discovered. It is shown that photoionization time delay in the autoionizing resonance region is explicitly associated with the resonance lifetime, which can, thus, be directly measured in attosecond time delay experiments. Similar features are expected to emerge in photoionization time delays of other transition-metal and rare-earth atoms with half-filed subshells that possess giant autoionization resonances as well.