Laser ablation of thin tungsten layers deposited on carbon substrate

Paris, P.; Aints, M.; Laan, M.; Kiisk, Madis; Likonen, J.; Kolehmainen, Jukka; Tervakangas, Sanna

doi:10.1016/j.fusengdes.2009.01.033

Cited by 11 publications

(7 citation statements)

References 16 publications

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“…Consequently, it was estimated that to obtain a precision of better than 5% RSD for 235 U/ 238 U ratios, at least 4.5 fg of 235 U was required. For minor isotope ratios (vs. 238 U), a precision of better than 20% RSD was obtained from 0.42 fg of 234 U and 1.1 fg of 236 U.…”

Section: Nuclear Materialsmentioning

confidence: 97%

Atomic spectrometry update. Industrial analysis: metals, chemicals and advanced materials

Carter

Fisher

Goodall

et al. 2010

J. Anal. At. Spectrom.

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Section: Nuclear Materialsmentioning

confidence: 97%

Atomic spectrometry update. Industrial analysis: metals, chemicals and advanced materials

Carter

Fisher

Goodall

et al. 2010

J. Anal. At. Spectrom.

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“…17,18 Laser-induced breakdown spectroscopy is promising for the in situ analysis of the deposits. [19][20][21][22][23] However, standard samples are not available and quantitative measurements require the use of a calibrationfree LIBS measurement procedure. 24 As the analysis involves elements of signicant different ionization and excitation energies, the spatial variation of temperature may strongly reduce the measurement accuracy if the model assumes a uniform plasma.…”

Section: Introductionmentioning

confidence: 99%

Diagnostics of nonuniform plasmas for elemental analysis via laser-induced breakdown spectroscopy: demonstration on carbon-based materials

Mercadier

Hermann

Grisolia

et al. 2013

J. Anal. At. Spectrom.

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International audienceWe investigate the plasma produced by the interaction of ultraviolet nanosecond laser pulses with a carbon fiber composite tile from the inner wall of a fusion reactor. The experiments are carried out in argon at a pressure of 5 x 10(4) Pa. Fast imaging is used to characterize the plume expansion dynamics and excited plasma species are followed by time-and space-resolved emission spectroscopy. The measurements show that ionized and highly excited plasma species are located in the front of the expanding plume, whereas neutral atoms and lower excited species dominate in the plasma core. By measuring the excitation temperature of metallic ions and neutral atoms, we evidence the existence of a temperature gradient that appears during the early expansion stage and remains up to delays typically used in material analysis via laser-induced breakdown spectroscopy. The knowledge of the spatial distribution of the plasma properties is then used to model the plasma emission spectrum. Assuming two plasma zones in local thermodynamic equilibrium of different temperatures and electron densities, we calculate the spectral radiance and compare it to the spatially integrated spectrum recorded with an Echelle spectrometer. From the best agreement between measured and computed spectra we deduce the elemental concentrations of carbon, hydrogen and metal impurities. The validity of the model is critically discussed and the measurement uncertainties are evaluated. The present approach is foreseen to improve the accuracy of analysis via laser-induced breakdown spectroscopy in many applications, in particular when materials of elements with significantly different ionization potentials are investigated

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“…In our earlier studies [8,9] we have observed that only time-resolved recording of the LIBS spectra allows a reliable identification of metal elements. Both the width of the data acquisition time-gate t and the delay time t d between a laser pulse and opening of the gate for data acquisition were varied and the optimum values corresponding to the best signal to background ratio were found.…”

Section: Introductionmentioning

confidence: 99%

Determination of elemental depth profiles by multi-spot averaging technique of LIBS spectra

Paris

Aints

Hakola

et al. 2011

Fusion Engineering and Design

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Laser ablation of thin tungsten layers deposited on carbon substrate

Cited by 11 publications

References 16 publications

Atomic spectrometry update. Industrial analysis: metals, chemicals and advanced materials

Atomic spectrometry update. Industrial analysis: metals, chemicals and advanced materials

Diagnostics of nonuniform plasmas for elemental analysis via laser-induced breakdown spectroscopy: demonstration on carbon-based materials

Determination of elemental depth profiles by multi-spot averaging technique of LIBS spectra

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