Laser scattered images observed from carbon plasma stagnation and following molecular formation

Nishimura, Kenji; Shibata, Ryoichi; Yabuuchi, T.; Sunahara, A.; Tanaka, K. A.

doi:10.1063/1.4883918

Cited by 6 publications

(3 citation statements)

References 17 publications

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“…In the case of hard stagnation, rapid accumulation of plasma material at the collision front leads to the formation of a dense layer of material between the two plasmas called stagnation layer [1]. The study of properties of stagnation layer has attracted the curiosity of researchers for the past four decades because of its broad range of applications in various fields of science such as inertial confinement fusion [2], laser induced breakdown spectroscopy [3], pulsed laser deposition [4], EUV lithography [5], understanding the formation of supernovae and its remnants [6] etc.…”

Section: Introductionmentioning

confidence: 99%

Study of stagnation layer of laterally colliding laser produced aluminium plasmas

Shilpa

Gopinath

2022

IOP Conf. Ser.: Mater. Sci. Eng.

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When two dense laser produced plasmas collide, a layer of plasma stagnates at the collision front exhibiting special properties, is called stagnation layer. The characteristics of stagnation layer formed due to the collision of two laser produced aluminium plasmas were studied using spectroscopic and the fast imaging techniques. Time gated Intensified Charge Coupled Device (ICCD) imaging was used to study the temporal evolution of stagnation region and time resolved spectroscopy was used to obtain information about the distribution of neutral as well as the ionic species in collision process of laterally colliding aluminum plasmas. Electron density and temperature of the stagnation layer were also calculated from the emission spectra. The overall experiment results clearly depict the peculiar properties of stagnation layer which is more advantageous than the conventional laser produced plasma.

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Section: Introductionmentioning

confidence: 99%

Study of stagnation layer of laterally colliding laser produced aluminium plasmas

Shilpa

Gopinath

2022

IOP Conf. Ser.: Mater. Sci. Eng.

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“…32–37 St-Onge et al 38 demonstrated that C 2 and C are released directly from the target of the graphite and that CN is formed later on by the interaction of C 2 with atmospheric nitrogen (N 2 ). Nishimura et al 39 established that large C molecular formation is initiated with the ion collision, followed by the formation of C 2 . The formation of CN molecular species also results from reactions between native C atoms and nitrogen present in ambient air.…”

Section: Introductionmentioning

confidence: 99%

Femtosecond Laser-Induced Breakdown Spectroscopy Studies of Nitropyrazoles: The Effect of Varying Nitro Groups

Rao

Soma

2015

Appl Spectrosc

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The technique of femtosecond laser-induced breakdown spectroscopy (FLIBS) was employed to investigate seven explosive molecules of nitropyrazole in three different atmospheres: ambient air, nitrogen, and argon. The FLIBS data illustrated the presence of molecular emissions of cyanide (CN) violet bands, diatomic carbon (C2) Swan bands, and atomic emission lines of C, H, O, and N. To understand the plasma dynamics, the decay times of molecular and atomic emissions were determined from time-resolved spectral data obtained in three atmospheres: air, argon, and nitrogen. The CN decay time was observed to be longest in air, compared to nitrogen and argon atmospheres, for the molecules pyrazole (PY) and 4-nitropyrazole (4-NPY). In the case of C2 emission, the decay time was observed to be the longest in argon, compared to the air and nitrogen environments, for the molecules PY, 4-NPY, and 1-methyl-3,4,5-trinitropyrazole. The intensities of the CN, C2, C, H, O, and N emission lines and various molecular/atomic intensity ratios such as CN/C2, CN(sum)/C2(sum), CN/C, CN(sum)/C, C2/C, C2(sum)/C, (C2 + C) / CN, (C2(sum) + C)/CN(sum), O/H, O/N, and N/H were also deduced from the LIBS spectra obtained in argon atmosphere. A correlation between the observed decay times and molecular emission intensities with respect to the number of nitro groups, the atmospheric nitrogen content, and the oxygen balance of the molecules was investigated. The relationship among the LIBS signal intensity, the molecular/atomic intensity ratios, and the oxygen balance of these organic explosives was also explored.

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“…One of the recent applications of colliding plumes is to simulate the fusion reactor chamber environment. 10 Laser induced colliding plasmas also find applications in inertial confinement fusion, x-ray lasers, and understanding the formation of super novae and its remnants. [11][12][13][14] Single plasma plumes have been investigated extensively using different experimental and theoretical techniques.…”

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confidence: 99%

Investigation of shock-shock interaction and Mach reflection in laterally colliding laser-blow-off plasmas

et al. 2015

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Interactions of two Li plasma plumes and shock waves are investigated at various pressures (∼10−5 to 3 mbar) in the argon gas ambient. Fast imaging and optical emission spectroscopy are used to study the plume dynamics and characteristic emission of plasmas. The plasma plumes are created in laser-blow-off geometry. The expansion of plasma plumes in the ambient gas leads to the formation of an interaction zone. The formation of interaction zone is dependent on the ambient pressure and below a certain pressure, no significant change is observed in the shape and size of the interaction plasma. In the higher pressure, formation of interaction zone and its shape are dependent on ambient pressure. Dynamics of seed plasmas and interaction zone are also affected by the shock-shock interactions. The shock-shock interaction depends on the angle of incidence (α) between two shock waves at the initial time of interaction but as the plumes expand, the shock-shock interaction does not follow α dependence.

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Laser scattered images observed from carbon plasma stagnation and following molecular formation

Cited by 6 publications

References 17 publications

Study of stagnation layer of laterally colliding laser produced aluminium plasmas

Study of stagnation layer of laterally colliding laser produced aluminium plasmas

Femtosecond Laser-Induced Breakdown Spectroscopy Studies of Nitropyrazoles: The Effect of Varying Nitro Groups

Investigation of shock-shock interaction and Mach reflection in laterally colliding laser-blow-off plasmas

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