A5038648582- Laser-induced spectroscopy and plasma
- Atomic and Molecular Physics
- Ion-surface interactions and analysis
- Diamond and Carbon-based Materials Research
- Laser-Plasma Interactions and Diagnostics
- Plasma Diagnostics and Applications
- Laser Design and Applications
- Particle accelerators and beam dynamics
- Metal and Thin Film Mechanics
- Laser Material Processing Techniques
- Electron and X-Ray Spectroscopy Techniques
- Photocathodes and Microchannel Plates
- Gyrotron and Vacuum Electronics Research
- Particle Accelerators and Free-Electron Lasers
- Mass Spectrometry Techniques and Applications
- Advanced Chemical Physics Studies
- Cultural Heritage Materials Analysis
- Polymer Nanocomposite Synthesis and Irradiation
- Silicon Nanostructures and Photoluminescence
- Surface Roughness and Optical Measurements
- bioluminescence and chemiluminescence research
- Perovskite Materials and Applications
- Analytical chemistry methods development
- Nuclear Physics and Applications
- Photoreceptor and optogenetics research
University of Salento
2015-2024
Istituto di Nanotecnologia
2023-2024
Imperial College London
2020
Daresbury Laboratory
2020
Istituto Nazionale di Fisica Nucleare
2012-2020
Istituto Nazionale di Fisica Nucleare, Sezione di Lecce
2006-2020
Cockcroft Institute
2020
Aix-Marseille Université
2015
Centre National de la Recherche Scientifique
2015
University of Salerno
2011
We demonstrate that chemical reactions leading to the formation of AlO radicals in plasmas produced by ablation aluminum or Ti-sapphire with ultraviolet nanosecond laser pulses can be predicted model local thermodynamic equilibrium. Therefore, emission spectra recorded an echelle spectrometer and a gated detector were compared spectral radiance computed for uniform nonuniform equilibrium plasmas. The calculations are based on analytical solutions radiation transfer equation. simulations show...
Improving the overall characteristics of semitransparent solar cells (STSCs) is a very hard goal, not only because absorption and transmission light through device are two competitive processes but also power conversion efficiency (PCE) decreases with angle incidence sunlight rays due to Fresnel law limits. Here, unprecedented single-junction perovskite STSCs have been fabricated thanks rational management transverse magnetic electric reflection modes dielectric/metal/dielectric triple layer...
We report on the results concerning characteristics and behavior of expanding plasma generated by a Laser Ion Source (LIS). The LIS technique is an efficient means in producing multi-charged ions utilizing pulsed laser beams. In order to extract Cu ions, this experiment XeCl excimer UV was employed, providing power density target surface up 5 × 10 8 W/cm 2 . Two typologies diagnostic systems were developed detect current ion energy. time-of-flight (TOF) measurements performed exploiting...
In this work the experimental results of a nonequilibrium laser-plasma induced by an ultraviolet 308 nm excimer laser are reported. All measurements were performed fixing energy at 70 mJ. It was concentrated on 0.0099 cm2 spot convergent focal lens 15 cm length. The utilized target 99.99% pure Cu disk. An 8 in diameter movable Faraday cup developed order to detect plasma flow pulse different positions along drift tube. Analyzing time-of-flight under bias voltage, we able distinguish electron...
The emission of multiply charged Cuq+ ions from a plasma produced by 308 nm excimer laser is analyzed with respect to the distance irradiated target. critical zone, outside which charge states expanding are frozen, was determined be approximately 20 cm This value estimated using charge-freezing criterion expressed dependence total carried Q∝L−2, describes dilution its expansion into vacuum without collisional recombination processes.
Abstract Time-of-flight spectra of C, Fe, and Si ions produced with the use a KrF excimer laser have been analyzed. Ion currents were collected by Faraday cups their responses analyzed using detector signal function. This function was derived from shifted Maxwell-Boltzmann velocity distribution, in order to uncover contribution partial all ionized species constituting expanding plasma plume. The deconvolution method allowed estimate parameters plasma, such as ion temperature center-of-mass...
We review the current status of metallic photocathodes based on thin films prepared by pulsed laser deposition (PLD) and we explore ways to improve performance these devices. PLD seems be a very efficient suitable technique for producing adherent uniform films. Time-resolved mass spectrometric investigations definitively suggest that high-purity should carried out in ultrahigh vacuum systems after deep careful cleaning target surface. Moreover, surface is highly recommended not only remove...
The ion emission from a Cu-plasma produced by 308 nm excimer laser is analysed time-of-flight spectroscopy and deconvolution of measured currents. current signals recorded an collector outside the critical zone, where charge-states ions expanding plasma are frozen, have been deconvoluted use Kelly Dreyfus equation. meaningful recovered currents for Cu+ Cu2+ compared with reconstructed energy analyser spectra. A velocity distribution abundance above presented. time-resolved average...
The laser ablation-induced plasma was used as a composition-controlled source for ion implantation in Si crystals. Then, ablation combination with inductively coupled mass spectrometry the elemental depth profiling of implanted samples. Monte Carlo simulations permitted us to conclude that resolution tens nm would be necessary define shape profiles, is obtained using XPS and RBS, whereas hundred sufficient determine total dose. detection power LA-ICP-MS routinely allow rapid analytical...
The effects of laser fluence on the growth characteristics and surface morphology yttrium films grown by pulsed deposition are investigated. presence droplets in deposited films, which is main drawback technique, was studied at different fluences. structure were scanning-electron microscopy x-ray diffraction, respectively. Careful microscope investigations obtained tilting samples show that arrive to substrate molten phase. ablation rate measured five fluences (0.9–7.6 J/cm2) shows a...
Pb thin films were deposited on Nb substrates by means of pulsed laser deposition (PLD) with UV radiation (248 nm), in two different ablation regimes: picosecond (5 ps) and subpicosecond (0.5 ps). Granular grain size the micron scale have been obtained, no evidence large droplet formation. All presented a polycrystalline character preferential orientation along (111) crystalline planes. A maximum quantum efficiency (QE) $7.3\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}5}$ (at 266 nm...
R\&D activity on Cu photocathodes is under development at the SPARC\_LAB test facility to fully characterize each stage of photocathode "life" and have a complete overview photoemission properties in high brightness photo-injectors. The nano(n)-machining process presented here consists diamond milling, blowing with dry nitrogen. This procedure reduces roughness cathode surface prevents contamination introduced by other techniques, such as polishing paste or machining oil. Both cause an...
Abstract In this work, two different techniques to modify polymeric surfaces are compared: laser irradiation and ion implantation. The treated polymers were samples of ultra high molecular weight polyethylene. treatment was performed by utilizing sources operating in the UV IR range applying many shots an air atmosphere. Ion implantation using a new source accelerator with accelerating voltage 40 kV. Contact angle, roughness Fourier transform infra red measurements carried out before after...
In this work, the authors compare morphological, structural, nanomechanical, and microtribological properties of Pb films deposited by thermal evaporation (TE) pulsed laser deposition (PLD) techniques onto Si (111) substrates. Films were investigated scanning electron microscopy, surface probe x-ray diffraction in θ-2θ geometry to determine their morphology, root-mean-square (RMS) roughness, microstructure, respectively. TE showed a percolated morphology with densely packed fibrous grains...
The experimental results of particle acceleration by plasma generated using a XeCl laser are described. ion source developed is able to accelerate specific particles and overcome the effects which occur specially during application accelerating voltage. In order successfully execute this experiment, expansion was highly necessary before voltage application. For goal an almost hermetic expanding chamber with hole at its end, used as extraction electrode, made. way arcs were eliminated...