Laser ablated Ti velocity distribution dynamics

Bauer, William A.; Perram, Glen P.

doi:10.1364/josab.35.000b27

Cited by 10 publications

(7 citation statements)

References 31 publications

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“…The double and triple components of plasma species in ambient gases have also been observed by several authors, 10,21,31,32 who found that they depend on laser fluence, gas pressure and the nature of the target. These double and triple structures could have different origins, such as deceleration, diffusion, thermalization of the ablated species, attenuation, chemical reactions, clustering, shock wave formation, and the recombination process.…”

Section: Resultssupporting

confidence: 58%

“…The double structure has also been observed by other authors using various characterization techniques under different experimental conditions on various targets, such as titanium, 21 copper, 22 aluminum, 23,24 alumina, 11 graphite 10,25 and zinc oxide, 26 in a vacuum environment. The appearance of the double peaks in laser ablation plasma generated in a vacuum has been attributed to the formation of an ambipolar electric eld (spatial charge separation) in the expanding plasma.…”

Section: Plasma Emission and Species Evolution In A Vacuumsupporting

confidence: 69%

“…Bauer et al 21 investigated the dynamics of laser-ablated titanium velocity distribution in a vacuum and background gases (Ar and He) using a gated intensified charged-coupled device (ICCD) camera and interferential filters at various distances. In a vacuum, the temporal profile of the Ti line is described by a double component, whereas that of the Ti + line is described by only one peak distribution.…”

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Investigation of AlN plasma induced by a laser into a vacuum and nitrogen ambience

Tekili,

Abdelli-Messaci,

Kaloune

et al. 2023

J. Anal. At. Spectrom.

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Section: Resultssupporting

confidence: 58%

Section: Plasma Emission and Species Evolution In A Vacuumsupporting

confidence: 69%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Investigation of AlN plasma induced by a laser into a vacuum and nitrogen ambience

Tekili,

Abdelli-Messaci,

Kaloune

et al. 2023

J. Anal. At. Spectrom.

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“…In experiments, a small detector is usually located at a large distance from the target in the direction normal to the evaporation surface. One of the main instruments to experimentally control the laser ablation and desorption processes is the measurements of the so-called time-of-flight (TOF) distributions of particles passing through this detector [ 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 ]. By analyzing the TOF distributions, one can improve understanding of the ablation mechanism as well as estimate the temperature of the evaporating surface [ 6 ] and the composition of the surface material [ 10 ].…”

Section: Introductionmentioning

confidence: 99%

Planar Gas Expansion under Intensive Nanosecond Laser Evaporation into Vacuum as Applied to Time-of-Flight Analysis

Morozov

Титарев

2022

Entropy

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A computational investigation of the dynamics of gas expansion due to intense nanosecond laser evaporation into vacuum has been carried out. The problem is solved in a one-dimensional approximation, which simplifies calculations and at the same time allows one to analyze the main features of the expansion dynamics. For analysis we use three different approaches. Two of them are based on kinetic analysis via the direct simulation Monte Carlo (DSMC) method and numerical solution of the model Bhatnagar–Gross–Krook (BGK) equation. The third one focuses on derivation of an analytical continuum solution. Emphasis is placed on the analysis of the velocity distribution function and the average energy of particles passing through the time-of-flight detector on the normal to the evaporation surface, which is important for interpreting experimental measurements. The formulated problem is quite difficult as the considered flow is time-dependent, contains discontinuities in boundary conditions and involves large variations of local Knudsen numbers as well as steep gradients of the velocity distribution function. Data were obtained on the particle energy in the time-of-flight distribution for the range of regimes from the free molecular flow to continuum one. The maximum attainable average energy of particles in the time-of-flight distribution is determined. The non-monotonicity of the energy increase was found, which is explained based on analysis of the velocity distribution of particles.

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“…2 :Sm because of its large work function, crystal (rutile) structure and thermal resistivity[21] [22].…”

mentioning

confidence: 99%

Improved Interface of Encapsulating Sm-Doped TiO<sub>2</sub> Thin Films/RuO<sub>2</sub> Schottky Diodes for a Junction Spectropy Measurement

Murayama¹,

Tamamoto²,

Qian³

et al. 2022

OPJ

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The excitation process of rare-earth ions in oxide semiconductors for optical emission is thought to be related to defect levels within the band-gap of the host material. In order to improve understanding of the role defect levels play in the energy transfer process, junction spectroscopy techniques can be used to investigate the electrically active emission centres. It has been reported that TiO 2 is sensitive to humidity at low temperatures, such as those employed when conducting junction spectroscopy measurements. However, there are not many discussions how to prevent this effect and to improve the quality of measurements. After optimization of samples such as fabrication of flat surface and encupsulant for preventing external effect, temperature dependent-capacitance measurements (C-T) were carried out to characterise shallow traps formed within TiO 2 band-gap. TiO 2 and Smdoped TiO 2 thin films were deposited on SrTiO 3 (100) templates by laser ablaton and rectifying Ruthenium Oxide Schottky diodes deposited on the TiO 2 surface by laser ablation. A Sm or Sm-related shallow trap was observed in the Arrhenius plot of TiO 2 :Sm. In this paper, we show the optimized sample fabrication/preparation process that stabilizes the junction spectroscopy measurements, even in the presence of humidity and we present initial results obtained on samples using these optimized processing techniques.

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Laser ablated Ti velocity distribution dynamics

Cited by 10 publications

References 31 publications

Investigation of AlN plasma induced by a laser into a vacuum and nitrogen ambience

Investigation of AlN plasma induced by a laser into a vacuum and nitrogen ambience

Planar Gas Expansion under Intensive Nanosecond Laser Evaporation into Vacuum as Applied to Time-of-Flight Analysis

Improved Interface of Encapsulating Sm-Doped TiO<sub>2</sub> Thin Films/RuO<sub>2</sub> Schottky Diodes for a Junction Spectropy Measurement

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Laser ablated Ti velocity distribution dynamics

Cited by 10 publications

References 31 publications

Investigation of AlN plasma induced by a laser into a vacuum and nitrogen ambience

Investigation of AlN plasma induced by a laser into a vacuum and nitrogen ambience

Planar Gas Expansion under Intensive Nanosecond Laser Evaporation into Vacuum as Applied to Time-of-Flight Analysis

Improved Interface of Encapsulating Sm-Doped TiO&lt;sub&gt;2&lt;/sub&gt; Thin Films/RuO&lt;sub&gt;2&lt;/sub&gt; Schottky Diodes for a Junction Spectropy Measurement

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Improved Interface of Encapsulating Sm-Doped TiO<sub>2</sub> Thin Films/RuO<sub>2</sub> Schottky Diodes for a Junction Spectropy Measurement