# Time-resolved Spectroscopy of Interparticle Coulombic Decay Processes

## TL;DR

This paper develops a theoretical framework for time-resolved spectroscopy of Interparticle Coulombic Decay (ICD), enabling measurement of decay lifetimes through observed oscillations in electron signals following ultrafast excitation.

## Contribution

It introduces a novel theoretical approach to analyze time-resolved ICD processes and proposes a method to measure electronic decay lifetimes via oscillations in electron signals.

## Key findings

- The spectrum of resonant ICD electrons develops after excitation.
- Strong-field ionization can quench ICD at different delays.
- Oscillations in ionization probability can be used to measure decay lifetimes.

## Abstract

We report theory for time-resolved spectator resonant Interparticle Coulombic Decay (ICD) processes. Following excitation by a short extreme ultraviolet pulse, the spectrum of the resonant ICD electron develops. Strong-field ionization is imagined to quench the decay at different time delays and to initiate regular ICD. In this latter process, the ICD electron signal can be measured without interference effects. The typical lifetimes of ICD processes allow for the observation of oscillations of the time- and energy-differential ionization probability. We propose to utilize this oscillation to measure lifetimes of electronic decay processes.