Anomalous Relativistic Emission from Self-Modulated Plasma Mirrors.

The interaction of intense laser pulses with plasma mirrors has demonstrated the ability to generate high-order harmonics, producing a bright source of extreme ultraviolet (XUV) radiation and attosecond pulses. Here, we report an unexpected transition in this process. We show that the loss of spatiotemporal coherence in the reflected high harmonics can lead to a new regime of highly efficient coherent XUV generation, with an extraordinary property where the radiation is directionally anomalous, propagating parallel to the mirror surface. With analytical calculations and numerical particle-in-cell simulations, we discover that the radiation emission is due to laser-driven oscillations of relativistic electron nanobunches that originate from a plasma surface instability.

Electrochemical analysis of a novel ferrocene derivative as a potential antitumor drug.

Ferrocenes represent an interesting group of drugs with potential antitumor properties. Moreover, their electronic properties make them suitable for electrochemical studies. We determined an uptake of a novel ferrocene derivative in low µM concentrations by selected cancer cell lines and showed its localization predominantly in cytoplasm, using glassy carbon electrodes.