A5102761556- Laser-induced spectroscopy and plasma
- Analytical chemistry methods development
- Diamond and Carbon-based Materials Research
- Ion-surface interactions and analysis
- High-Energy Particle Collisions Research
- Particle physics theoretical and experimental studies
- Laser Design and Applications
- Atomic and Molecular Physics
- Silicon Nanostructures and Photoluminescence
- Laser-Ablation Synthesis of Nanoparticles
- Mass Spectrometry Techniques and Applications
- Advanced Chemical Physics Studies
- Quantum Chromodynamics and Particle Interactions
- Mercury impact and mitigation studies
- Building materials and conservation
- Laser Material Processing Techniques
- Spectroscopy and Laser Applications
- Plasma Applications and Diagnostics
- Porphyrin and Phthalocyanine Chemistry
- Muon and positron interactions and applications
- Copper Interconnects and Reliability
- Phase-change materials and chalcogenides
- Glass properties and applications
- Particle Detector Development and Performance
- Analytical Chemistry and Sensors
Hospital Universitario 12 De Octubre
2025
Centro Científico Tecnológico - Bahía Blanca
2025
Universidad Católica Santo Toribio de Mogrovejo
2023
Instituto de Estructura de la Materia
2007-2018
Consejo Superior de Investigaciones Científicas
1989-2014
Universidad Nacional Autónoma de México
2008-2012
Universidad de Cantabria
2011
Executive Office of the President
2010
University of Trinidad and Tobago
2010
University of Buenos Aires
1985-2009
Large-scale plasma produced in nitrogen gas at room temperature and pressures ranging from 4 × 10 3 to 1.2 5 Pa by high-power laserinduced dielectric breakdown (LIDB) has been investigated.Time-integrated optical spectra excited a CO 2 laser have measured analysed.The spectrum of the generated is dominated emission strong N + very weak 2+ atomic lines molecular features ofand B g -A u .The relative intensities 0-0 band heads (C-B) (B-X) systems are as compared with chemiluminescence formed...
Direct electrical communication between a new acrylamide–acrylic acid ferrocence copolymer and the enzyme cofactor FADH2 of glucose oxidase is demonstrated. Subsequent catalysis for anaerobic oxidation at co-reticulated enzyme–polymer-modified electrode shown polymer-coated glassy carbon composite carbon-paste electrode. A theoretical framework kinetic analysis reagentless amperometric outlined model validated with experimental results. Based on this analysis, data ping-pong mechanism are...
Time-resolved optical emission spectroscopy (OES) is used to analyze a mesh-initiated air breakdown plasma induced by transverse excitation atmospheric CO2 pulsed laser (λ=10.591 μm, 64 ns (full width at half maximum), 70–160 J/cm2). Emission from excited N, O, C, H, and Ar; ionic fragment N+, O+, N2+, O2+, C+, molecular band systems of N2+(B Σ2u+−X Σ2g+; D Π2g−A Π2u), N2(C Π3u−B Π3g), OH(A Σ2+−X Π2) observed. Plasma characteristics are examined in detail on the lines C time-resolved OES...
Abstract Solid‐state 13 C NMR spectra of 14 N‐containing compounds obtained under CPMAS conditions often show asymmetric doublets arising from the unaveraged C, N residual dipolar coupling. A similar result has recently been noticed in deuteriated samples, whose resonances showed combined effect 2 H and scalar couplings. simple approach, easily adaptable to a desk microcomputer, is described for simulating line shapes arbitrary values quadrupole parameters, CX (X = N, H) distances, external...
Optical emission spectroscopy studies, in the spectral range ultraviolet–visible–near infrared (UV–Vis–NIR), were performed to investigate thermal and dynamical properties of a plume produced by laser ablation graphite target. Ablation is carried out using high-power IR CO2 pulsed at λ = 9.621 µm, power density ranging from 0.22 5.36 GW cm−2 air pressures around 4 Pa. The strong observed plasma region mainly due electronic relaxation excited C, ionic fragments C+, C2+ C3+ molecular features...
Laser-induced breakdown (LIB) spectroscopy in oxygen at room temperature and pressures ranging from 4.6 to 75 kPa was studied using a high-power transverse excitation atmospheric CO 2 laser (λ = 9.621 10.591 µm; τ FWHM 64 ns; power densities 0.87 6.31 GW cm -2 ).The spectrum of the generated plasma is dominated by emission strong O, O + weak 2+ atomic lines.Excitation temperatures 31 500 ± 1600 K 23 000 3000 were estimated means ionic lines, respectively.Electron number order (3.5-16.5)× 10...
Co-decomposition of gaseous mixtures silacyclopent-3-ene and Fe(CO)5 by irradiation at (9 + 10) 10 5) µm from two CO2 lasers is reported. In a one-step process, this produced nanosized (α-Fe)-based particles that consist both superparamagnetic ferromagnetic phases. They were enveloped within thin graphitic shell embedded in an organosilicon polymer matrix. Properties the nanocomposites, examined infrared Raman spectroscopies, high resolution transmission electron microscopy magnetization...
The formation mechanism and stability of silicon oxide clusters observed in the ablation SiO targets at 266 nm were investigated by time-of-flight mass spectrometry, laser-induced fluorescence (LIF), DFT calculations. Neutral positively charged Sin+/0 SinOmH0,1+ identified plume, but neutral SinOm could not be observed. time distribution plume measured postionization with an ArF laser (Δλ ≈ 1 nm, τ 14 ns) spectrometric detection was compared that obtained LIF narrowband dye selective...
Time-resolved optical emission measurements have been made in laser-induced plasma plumes following CO2 pulsed-laser (10.591 μm, 64 ns and intensity from 0.27 to 4.9 GW cm−2) irradiation of germanium targets. The temporal behavior Ge atoms ionized excited species Ge3+, Ge2+, Ge+ is reported. results show a faster decay the continuum Ge2+ ionic than case neutral atoms. velocity distributions for Ge+, are obtained time-of-flight measurements. Electron density was estimated analysis spectral...
The analytical dependence of sigma(n) and sigma(k) on related experimental uncertainties when conventional reflectance-transmittance methods for the determination optical constants thin films are used has been found. Two kinds singularity appear. These responsible loss solution in these methods. From properties derivatives n k with respect to measured thickness, a new method developed without solution. Different derivative behaviors physical nonphysical solutions were film thickness is also...
Laser-induced multiphoton and SF6-photosensitised decomposition of tetramethoxygermane has been used for chemical vapour deposition reactive organooxogermanium polymers, which were characterised by IR, VIS, UV spectra ESCA TEM techniques. The properties the deposited layers differed depending on mode decomposition. films towards ambient atmosphere; this is discussed in terms reaction CH3OGe groups with air moisture.
Time-resolved optical emission analysis was carried out for the plasma plume, produced by high-power tunable IR CO2 pulsed laser ablation of graphite, at λ=10.591 μm and in a regime relatively high fluences (123–402 J/cm2). Wavelength-dispersed spectra medium-vacuum conditions (4 Pa) 9.0 mm from target, show ionized species (C+, C2+, C3+, C4+, N2+ , N+, O+), neutral atoms (C, H, N, O), diatomic molecules (C2, CN, OH, CH, N2). In this work, we focus our attention on temporal evolution...
We report on the plume dynamics of plasma induced by laser ablation a swine skeletal muscle tissue sample in different vacuum conditions. Pulses from transversely excited atmospheric CO 2 were focused onto target and was allowed to expand air pressures. The expansion features studied using fast photography overall visible emission gated intensified charged coupled device. Free splitting observed at pressure levels. front analyzed various models velocity estimated. effect number accumulated...