Effective Transparency in the XUV: A Pump-Probe Test of Atomistic Laser-Cluster Models

TL;DR

This study predicts a range of laser intensities where rare-gas clusters become effectively transparent to XUV probe pulses after saturation by an XUV pump, with implications for experimental verification and plasma effects.

Contribution

It introduces an atomistic hybrid quantum-classical model to predict effective transparency in laser-irradiated clusters, highlighting size-dependent effects and experimental testability.

Findings

Existence of an intensity range for effective transparency.

Transparency range increases with cluster size.

Predictions for experimental signals and plasma effects.

Abstract

The effective transparency of rare-gas clusters, post-interaction with an extreme ultraviolet (XUV) pump pulse, is predicted by using an atomistic hybrid quantum-classical molecular dynamics model. We find there is an intensity range for which an XUV probe pulse has no lasting effect on the average charge state of a cluster after being saturated by an XUV pump pulse: the cluster is effectively transparent to the probe pulse. The intensity range for which this phenomena occurs increases with cluster size, and thus is amenable to experimental verification. We present predictions for clusters at the peak of the laser pulse profile, as well as the expected experimental time-of-flight signal integrated over the laser profile. Since our model uses only atomic photoionization rates, significant experimental deviations from our predictions would provide evidence for modified ionization potentials due to plasma effects.