Langmuir probe measurement of plasma splitting during pulsed laser deposition

Wild, Jan; Kudrna, P.; Gronych, T.; Brož, Jan; Zelinger, Zdeněk; Kubát, Pavel; Civiš, Svatopluk

doi:10.1063/1.1342031

Cited by 10 publications

(5 citation statements)

References 7 publications

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“…The following differences were noted at 10 −2 mbar: (i) the current profile is delayed in time, (ii) the area under the current profile is higher and (iii) the number of multiple peaks was reduced. The ion current profile at 10 −2 mbar had a two-peak structure, which is in agreement with results obtained from LP measurements [24] and spectroscopic studies [6,7,25]. In the presence of background gas, the increase in time delay was due to the drag force whereas the enhancement in intensity was due to confinement of the plume.…”

Section: Measurement Of Electron Temperature and Density At Higher Ba...supporting

confidence: 88%

Measurements of electron temperature and density of multi-component plasma plume formed by laser-blow-off of LiF-C film

Sunil¹,

Kumar²,

Singh³

et al. 2008

J. Phys. D: Appl. Phys.

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The evolution features of electrons and ions generated by laser-blow-off (LBO) of a multi-component LiF-C target have been studied using optical spectroscopic and Langmuir probe (LP) techniques. In addition to the hydrodynamic plume splitting, multi-peak structures are reported in the temporal profiles of ions measured by the LP. We propose that the observed multi-peaks arise due to the mass dependent expansion velocity of different elements present in the plasma plume. The temporal evolutions of electron density and temperature are reported in vacuum and in a 10−2 mbar argon environment. The electron temperature of the LBO plume was found to be higher than the electron temperature of laser produced plasma from solids. It was observed that the LP was perturbing the evolving plasma plume when it was placed at a short distance from the target. We have experimentally determined the distance between the target and LP beyond which it did not perturb the characteristic features of plume expansion. No previous data related to LBO plasma exist for a direct comparison with the present results.

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Section: Measurement Of Electron Temperature and Density At Higher Ba...supporting

confidence: 88%

Measurements of electron temperature and density of multi-component plasma plume formed by laser-blow-off of LiF-C film

Sunil¹,

Kumar²,

Singh³

et al. 2008

J. Phys. D: Appl. Phys.

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“…These processes can be enhanced either by reducing the characteristic carbon ion energy or by increasing the background pressure, which results in a shorter mean free path for collisions involving buffer gas atoms, and also in a reduction of the characteristic ion energy by collisions. The observation of two characteristic C 2 -rich plasma fronts can be explained by the fact that at near vacuum or low pressure, two carbon ion plasma fronts are observed, as seen in figure 7, and reported previously [23,24]. The polar dependence of the C 2 emission observed in the second front, at later times in figure 7, might be related to the known polar distribution observed in the plasma ion energy spectrum, which exhibits a decrease in energy, as the polar angle with respect to the target normal increases [25].…”

Section: Discussionsupporting

confidence: 76%

Time- and space-resolved spectroscopic characterization of a laser carbon plasma plume in an argon background

Ruiz¹,

Guzmán²,

Favre³

et al. 2012

Plasma Sources Sci. Technol.

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We present time-and space-resolved spectroscopic observations of a laser-produced carbon plasma, in an argon background. An Nd : YAG laser pulse, 370 mJ, 3.5 ns, at 1.06 µm, with a fluence of 6.9 J cm −2 , is used to produce a plasma from a solid graphite target in a 0.5 to 415 mTorr argon background. The spectral emission in the visible is recorded with 15 ns time resolution. We use 20 ns time resolution plasma imaging, filtered at characteristic carbon species emission wavelengths, to study the dynamics of the expanding plasma. The carbon plasma emission is found to evolve from the characteristic of single ionized carbon, to a more complex one, where C 2 and C 3 molecular bands dominate. Several plasma fronts, with either ionic or molecular composition, are seen to detach from the laser target plasma. The temporal and spatial features of the molecular carbon species evolution are found to be dependent on the actual argon background pressure.

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“…Wild et. al has also observed this type of plasma splitting during PLD [14].On increasing distance from 40 mm to 60 mm, the second peak in electron TOF signal (slow) again splits in two parts, as indicated in figure 3(a). Thus a triple peak structure is observed at a distance of 50 mm.…”

Section: Electron and Ion Time-of-flight (Tof) Signalsmentioning

confidence: 55%

Spatial distribution of electron temperature and ion density in laser induced ruby (Al₂O₃:Cr³⁺) plasma using Langmuir probe

2012

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The investigation of laser produced ruby (Al 2 O 3 :Cr 3+ ) plasma using a planar copper Langmuir probe is reported in the present paper. The ruby plasma was produced by focusing a high power Q-switched Nd:YAG laser on ruby target in a vacuum chamber at a base pressure of ∼ 10 −5 mbar. The effect of probe distance on electron and ion time of flight (TOF) signals were studied. Twin peaks were observed for both ions as well as electron signal, confirming the two velocity components for both these species. A triple peak structure was also observed in case of electron TOF signal due to re-splitting of second peak at 50 and 60 mm probe distance. The electron temperature was estimated using characteristic I-V curve of Langmuir probe. It was found to decay exponentially from 16.0 eV to 4.5 eV with increase in distance from 5 mm to 80 mm w.r.t. target. The ion density was found to first increase from 1.2 × 10 12 cm −3 to 1.0 × 10 13 cm −3 upto 40 mm, and then dropped down to 1.6 × 10 12 cm −3 at 50 mm and finally shows steady behavior.

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Langmuir probe measurement of plasma splitting during pulsed laser deposition

Cited by 10 publications

References 7 publications

Measurements of electron temperature and density of multi-component plasma plume formed by laser-blow-off of LiF-C film

Measurements of electron temperature and density of multi-component plasma plume formed by laser-blow-off of LiF-C film

Time- and space-resolved spectroscopic characterization of a laser carbon plasma plume in an argon background

Spatial distribution of electron temperature and ion density in laser induced ruby (Al₂O₃:Cr³⁺) plasma using Langmuir probe

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Langmuir probe measurement of plasma splitting during pulsed laser deposition

Cited by 10 publications

References 7 publications

Measurements of electron temperature and density of multi-component plasma plume formed by laser-blow-off of LiF-C film

Measurements of electron temperature and density of multi-component plasma plume formed by laser-blow-off of LiF-C film

Time- and space-resolved spectroscopic characterization of a laser carbon plasma plume in an argon background

Spatial distribution of electron temperature and ion density in laser induced ruby (Al2O3:Cr3+) plasma using Langmuir probe

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Spatial distribution of electron temperature and ion density in laser induced ruby (Al₂O₃:Cr³⁺) plasma using Langmuir probe