Chargel species analysis as a diagnostic tool for laser produced plasma characterization

Amoruso, S.; Armenante, M.; Berardi, V.; Pica, Giovanni; Velotta, R.

doi:10.1016/s0169-4332(96)00437-0

Cited by 29 publications

(6 citation statements)

References 23 publications

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“…The small peak of photoelectrons produced by VUV light emitted from the ablated plasma enables us to determine t = 0 for the TOF spectrum. We have assumed that all emitted species are singly charged in agreement with measurements carried out under similar conditions [19]. The ion energy distribution for the silver ions is shown in fig.…”

mentioning

confidence: 82%

Angular distributions of silver ions and neutrals emitted in vacuum by laser ablation

1997

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mentioning

confidence: 82%

Angular distributions of silver ions and neutrals emitted in vacuum by laser ablation

1997

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“…The energy often reaches up to several hundreds of eV. [1][2][3] The ejected species form a plasma plume. In the plume, the ablated species undergo various chemical reactions by themselves and also with ambient species.…”

Section: Introductionmentioning

confidence: 99%

Characterization of ablated species in laser-induced plasma plume

Furusawa¹,

Sakka²,

Ogata³

2004

Journal of Applied Physics

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Plasma electron density and atomic population densities in the plasma plume produced by a laser ablation of aluminum metal were determined in various ambient gases at relatively high pressures. The method is based on the fit of a spectral line profile of Al͑I) 2 P ‫ؠ‬-2 S emission to the theoretical spectrum obtained by one-dimensional radiative transfer calculation. The electron density was higher for a higher ambient gas pressure, suggesting the confinement of the plume by an ambient gas. The electron density also depends on the type of ambient gases, i.e., it increased in the order HeϽCH 4 ϽN 2 ϽCF 4 , while the atomic population density is almost independent of the type of ambient species and pressure. The population densities of the upper and lower levels of the transition were compared, and the ratio between their spatial distribution widths was calculated. These results provide valuable information regarding the confinement of the plume by the ambient gas and give insight into the time evolution of the plume.

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“…The energy of the heated electrons is then transferred to the neutrals and ions through collisions. The time needed to transfer the energy from the electrons to the ions, i.e., the electron-ion thermalization time scale (10 À10 to 10 À11 s), 15 is much shorter than the ns laser pulse duration resulting in the establishment of local thermal equilibrium (LTE) between the electrons and the ions during the early portion of the laser pulse. 15,16 Due to the mass differences between the electrons and the ions, fast electrons escape the plasma plume much earlier than the ions.…”

Section: Introductionmentioning

confidence: 99%

“…The time needed to transfer the energy from the electrons to the ions, i.e., the electron-ion thermalization time scale (10 À10 to 10 À11 s), 15 is much shorter than the ns laser pulse duration resulting in the establishment of local thermal equilibrium (LTE) between the electrons and the ions during the early portion of the laser pulse. 15,16 Due to the mass differences between the electrons and the ions, fast electrons escape the plasma plume much earlier than the ions. The spacecharge separation between the fast electrons and the ions that are lagging behind prevents some electrons from escaping the a) plasma resulting in the establishment of a self-electrostatic field at the expanding plasma-vacuum interface.…”

Section: Introductionmentioning

confidence: 99%

Characterization of laser-generated aluminum plasma using ion time-of-flight and optical emission spectroscopy

Shaim

Elsayed-Ali

2017

Journal of Applied Physics

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Laser plasma generated by ablation of an Al target in vacuum is characterized by ion time-of-flight combined with optical emission spectroscopy. A Q-switched Nd:YAG laser (wavelength k ¼ 1064 nm, pulse width s $ 7 ns, and fluence F 38 J/cm 2) is used to ablate the Al target. Ion yield and energy distribution of each charge state are measured. Ions are accelerated according to their charge state by the double-layer potential developed at the plasma-vacuum interface. The ion energy distribution follows a shifted Coulomb-Boltzmann distribution. Optical emission spectroscopy of the Al plasma gives significantly lower plasma temperature than the ion temperature obtained from the ion time-of-flight, due to the difference in the temporal and spatial regions of the plasma plume probed by the two methods. Applying an external electric field in the plasma expansion region in a direction parallel to the plume expansion increases the line emission intensity. However, the plasma temperature and density, as measured by optical emission spectroscopy, remain unchanged.

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Chargel species analysis as a diagnostic tool for laser produced plasma characterization

Cited by 29 publications

References 23 publications

Angular distributions of silver ions and neutrals emitted in vacuum by laser ablation

Angular distributions of silver ions and neutrals emitted in vacuum by laser ablation

Characterization of ablated species in laser-induced plasma plume

Characterization of laser-generated aluminum plasma using ion time-of-flight and optical emission spectroscopy

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