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Keywords = multiphoton ionisation

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13 pages, 4343 KB  
Article
Metal Nanoparticle Film Deposition by Femtosecond Laser Ablation at Atmospheric Pressure
by Tony Donnelly, Gearoid O’Connell and James G. Lunney
Nanomaterials 2020, 10(11), 2118; https://doi.org/10.3390/nano10112118 - 25 Oct 2020
Cited by 12 | Viewed by 3865
Abstract
Nanoparticle gold films were deposited using femtosecond laser ablation in argon at atmospheric pressure in an arrangement where a flat Au target was irradiated through a transparent substrate in close proximity. Spatially extended films were made by rastering the target and substrate assembly [...] Read more.
Nanoparticle gold films were deposited using femtosecond laser ablation in argon at atmospheric pressure in an arrangement where a flat Au target was irradiated through a transparent substrate in close proximity. Spatially extended films were made by rastering the target and substrate assembly together in the laser beam. Fast imaging clearly showed pronounced narrowing of the ablation plume, which can be understood in terms of laser induced multiphoton ionisation and heating of the gas near the ablation site. Deposition was possible for target-substrate separation up to 2 mm. The equivalent thickness of the nanoparticle film was controlled in the range 0.4–28 nm by changing the target-substrate separation and the shot-to-shot spacing of ablation spot raster. The mean Feret diameter varied in the range 14–40 nm depending on the deposition conditions, and all the films showed a surface plasmon resonance at about 525 nm, which was nearly independent of the equivalent thickness. The technique can readily be applied to other materials for the fabrication of nanoparticulate films at atmospheric pressure. Full article
(This article belongs to the Special Issue Laser Synthesis and Modification of Materials at the Nanoscale)
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17 pages, 989 KB  
Article
Radial and Angular Electron Ejection Patterns of Two-Electron Quantum Dots in THz Fields
by Adam Prior, Henri Bachau and Lampros A. A. Nikolopoulos
Atoms 2020, 8(3), 38; https://doi.org/10.3390/atoms8030038 - 21 Jul 2020
Cited by 1 | Viewed by 3003
Abstract
In this work, we develop and apply an ab-initio method to calculate the joint radial- and- angular electron distributions following the interaction of two-electron spherical quantum dots (QD) with intense terahertz pulses of subpicosecond duration. By applying the method to two QDs of [...] Read more.
In this work, we develop and apply an ab-initio method to calculate the joint radial- and- angular electron distributions following the interaction of two-electron spherical quantum dots (QD) with intense terahertz pulses of subpicosecond duration. By applying the method to two QDs of different size, we could investigate two particular ionization mechanisms: the direct and the sequential two-photon double ionization. According to our results, the two ionization mechanisms show some similarity in the angular distribution patterns, whereas the corresponding radial distributions are distinctly different, associated with their joint kinetic energy spectrum. We also discuss the time-evolution of the ionization process in the context of the different nature of the interaction of the QD with the external radiation and the electron–electron correlation interactions. Full article
(This article belongs to the Section Atomic, Molecular and Nuclear Spectroscopy and Collisions)
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