Researchers employed intense laser fields to uncover unique electron dynamics in liquids, providing new insights into the high-harmonic spectrum and revealing the significance of the electron's mean free path in determining photon energy limits. The behavior of electrons in liquids plays a big ro
An intense laser pulse hits a flow of water molecules, inducing an ultrafast dynamics of the electrons in the liquid. Credit: Joerg M. Harms / MPSD
An international team of researchers has now demonstrated that it is possible to probe electron dynamics in liquids using intense laser fields and to retrieve the electron’s mean free path — the average distance an electron can travel before colliding with another particle. The team of researchers, which also included scientists from the Max Planck Institute for the Structure and Dynamics of Matter in Hamburg and ETH Zurich, reported on the unique behavior of liquids when irradiated by intense lasers. Until now, almost nothing is known about these light-induced processes in liquids, which surround us everywhere and are present in every chemical reaction.
“The distance an electron can travel in the liquid before colliding with another particle is the crucial factor that imposes a ceiling on the photon energy,” said MPSD researcher Nicolas Tancogne-Dejean, a co-author of the study. “We were able to retrieve this quantity — known as the effective electron mean free path — from the experimental data thanks to a specifically developed analytical model which accounts for the scattering of the electrons.
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