Spatial confinement effects in laser-induced breakdown spectroscopy

Shen, X. K.; Sun, Jian; Líu, Hao; Lu, Yongfeng

doi:10.1063/1.2770772

Cited by 80 publications

(28 citation statements)

References 7 publications

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“…27 Plasma properties are found to be highly dependent on the background gas which confines its expansion in the normal and tangential directions. 28,29 In addition, physical confinement of the plasma plume by placing a parallel metallic plate enclosure on the target surface 30 or the generation of plasma plumes inside rectangular cavities 31,32 affect the spatial and temporal distributions of a plasma's properties.…”

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confidence: 99%

Ion flux enhancements and oscillations in spatially confined laser produced aluminum plasmas

et al. 2014

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Ion signals from laser produced plasmas (LPPs) generated inside aluminum rectangular cavities at a fixed depth d = 2 mm and varying width, x = 1.0, 1.6, and 2.75 mm were obtained by spatially varying the position of a negatively biased Langmuir probe. Damped oscillatory features superimposed on Maxwellian distributed ion signals were observed. Depending on the distance of the probe from the target surface, three to twelve fold enhancements in peak ion density were observed via confinement of the LPP, generated within rectangular cavities of varying width which constrained the plasma plume to near one dimensional expansion in the vertical plane. The effects of lateral spatial confinement on the expansion velocity of the LPP plume front, the temperature, density and expansion velocity of ions, enhancement of ion flux, and ion energy distribution were recorded. The periodic behavior of ion signals was analyzed and found to be related to the electron plasma frequency and electron-ion collision frequency. The effects of confinement and enhancement of various ion parameters and expansion velocities of the LPP ion plume are explained on the basis of shock wave theory.

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Ion flux enhancements and oscillations in spatially confined laser produced aluminum plasmas

et al. 2014

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“…Similar focussing/narrowing of the plasma plume in presence of ambient gas has been reported for conventional LPP experiments under different experimental schemes [20][21][22]. Bulgakova et al [22] proposed a most realistic model to explain the focusing (lateral confinement) of laser-produced plasma based on the analogy between an ablated plume and a supersonic under-expanded gaseous jet expanding into the background gas.…”

Section: Resultsmentioning

confidence: 90%

Effect of ambient gas on the expansion dynamics of plasma plume formed by laser blow off of thin film

et al. 2009

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A study has been carried out to understand the influence of ambient gases on the dynamics of laser-blowoff plumes of multi-layered LiF-C thin film. Plume images at various time intervals ranging from 100 to 3000 ns have been recorded using an intensified CCD camera. Enhancement in the plume intensity and change in size and shape occurs on introducing ambient gases and these changes are highly dependent on the nature and composition of the ambient gas used. Velocity of the plume was found to be higher in helium ambient whereas intensity enhancement is greater in argon environment. The plume shapes have maximum size at 10 −2 and 10 −1 Torr of Ar and He pressures, respectively. As the background pressure increases further (>10 −2 Torr: depending on the nature of gas), the plume gets compressed/focused in the lateral direction. Internal structure formation and turbulences are observed at higher pressures (>10 −1 Torr) in both ambient gases.

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“…These plume narrowing or broadening regimes are both explained in terms of gas scattering effects. Shen et al 12 reported the spatial confinement effects in Al plasma plume between a pair of Al-plate walls, due to the reflection and the compression of the shock wave.…”

Section: Fast Imaging Of Laser-blow-off Plume: Lateral Confinement Inmentioning

confidence: 99%

Fast imaging of laser-blow-off plume: Lateral confinement in ambient environment

George

Kumar

Singh

et al. 2009

Applied Physics Letters

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The dynamics of plasma plume, formed by the laser-blow-off of multicomponent LiF-C thin film under various ambient pressures ranging from high vacuum to argon pressure of 3 Torr, has been studied using fast imaging technique. In vacuum, the plume has ellipsoidal shape. With the increase in the ambient pressure, sharp plume boundary is developed showing a focusing-like (confinement in the lateral space) behavior in the front end, which persists for long times. At higher ambient pressure (>10−1 Torr), structures are developed in the plasma plume due to hydrodynamic instability/turbulences.

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Spatial confinement effects in laser-induced breakdown spectroscopy

Cited by 80 publications

References 7 publications

Ion flux enhancements and oscillations in spatially confined laser produced aluminum plasmas

Ion flux enhancements and oscillations in spatially confined laser produced aluminum plasmas

Effect of ambient gas on the expansion dynamics of plasma plume formed by laser blow off of thin film

Fast imaging of laser-blow-off plume: Lateral confinement in ambient environment

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