Abstract

This study presents a novel approach to infrared (IR) laser-driven diffusion through metal capillaries, focusing on the influence of the electromagnetic field distribution on the resonant character of gas diffusion. The experimental investigation examines the behavior of a mixture of sulfur hexafluoride (SF₆), acting as the resonant species, and nitrogen (N₂) under IR irradiation as they diffuse through a nickel (Ni) capillary. A waveguide model is proposed to explain the interaction between the electromagnetic field and the heterogeneous system, shedding light on the persistence of selective effects at high pressures exceeding the Knudsen flow regime, up to 7 Torr. The findings indicate that field intensity variations affect molecular trajectories, leading to selective adsorption and diffusion processes. Additionally, differences between adsorption behaviors within capillaries and in bulk conditions are analyzed, with waveguiding effects and resonant adsorption playing a key role in determining the observed effects.

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Dragnea Research is at the forefront of multidisciplinary innovation, exploring the intersection of nanoscale optics, quantum photonics, physical virology, and bio-architected hybrid materials with 3D nanoscale order. Their latest publications highlight groundbreaking advancements in fields such as self-assembly, optics and spectroscopy, and the physical manipulation of virus-like particles (VLPs) for chemical imaging and surface modifications. Drawing from their expertise in using near-field scanning techniques and laser-induced effects, these works showcase how nanoscale phenomena can be harnessed for applications in material science, virology, and beyond. The accompanying visual mosaic underscores the diverse range of their research, from probing molecular dynamics to the development of 3D-ordered structures, all united by a commitment to pushing the boundaries of applied and theoretical science.