Determination of the thickness of silver, gold and nickel layers by a laser microprobe and flame atomic absorption technique

T. Kántor, L. Bezúr, E. Pungor, P. Fodor, J. Nagy-Balogh, Gy Heincz

Research output: Article

21 Citations (Scopus)

Abstract

Vapour-aerosol mixture generated by a laser beam was introduced into an acetylene air flame for atomic absorption detection. A laser chamber, injector and transport system are described, suitable for combination with any commercial laser-microprobe apparatus and atomic absorption spectrophotometer. Ruby laser with passive Q-switch was applied at max. 1000 J energy input, and the role of laser parameters and gas flow rates was studied using a silver plate as target. Copper sheets were electroplated with layers of varying thickness, analysed by conventional (solution) atomic absorption methods and used for the standardization of the solid sample method. With laser parameters appropriate for a complete evaporation of the layer by a single shot, calibration graphs close to a linear shape were found in 1-16 μm silver, 0. 5-8 μm gold and 1-12 μm nickel ranges. Peak absorbance measurements resulted in RSDs of 9.4% (silver), 8.4% (gold) and 14% (nickel) as averages for these ranges of thickness. At laser, flame and optical conditions of highest atomic absorption sensitivity, the approximate limits of detection were: 0.025 μm silver, 0.032 μm gold and 0.073 μm nickel. The accuracy of calibration based on microscopic measurement of the crater depth was investigated with laser parameters suitable for gradual evaporation (multiple shots on the same spot) of the layer. Accurate results for nickel layer and high errors for silver and gold layers were found with this calibration method.

Original languageEnglish
Pages (from-to)341-357
Number of pages17
JournalSpectrochimica Acta - Part B Atomic Spectroscopy
Volume34
Issue number9-10
DOIs
Publication statusPublished - 1979

Fingerprint

Nickel
Silver
Gold
flames
silver
nickel
gold
Lasers
lasers
Calibration
shot
evaporation
Evaporation
ruby lasers
standardization
Acetylene
Ruby
spectrophotometers
injectors
craters

ASJC Scopus subject areas

  • Analytical Chemistry
  • Spectroscopy

Cite this

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title = "Determination of the thickness of silver, gold and nickel layers by a laser microprobe and flame atomic absorption technique",
abstract = "Vapour-aerosol mixture generated by a laser beam was introduced into an acetylene air flame for atomic absorption detection. A laser chamber, injector and transport system are described, suitable for combination with any commercial laser-microprobe apparatus and atomic absorption spectrophotometer. Ruby laser with passive Q-switch was applied at max. 1000 J energy input, and the role of laser parameters and gas flow rates was studied using a silver plate as target. Copper sheets were electroplated with layers of varying thickness, analysed by conventional (solution) atomic absorption methods and used for the standardization of the solid sample method. With laser parameters appropriate for a complete evaporation of the layer by a single shot, calibration graphs close to a linear shape were found in 1-16 μm silver, 0. 5-8 μm gold and 1-12 μm nickel ranges. Peak absorbance measurements resulted in RSDs of 9.4{\%} (silver), 8.4{\%} (gold) and 14{\%} (nickel) as averages for these ranges of thickness. At laser, flame and optical conditions of highest atomic absorption sensitivity, the approximate limits of detection were: 0.025 μm silver, 0.032 μm gold and 0.073 μm nickel. The accuracy of calibration based on microscopic measurement of the crater depth was investigated with laser parameters suitable for gradual evaporation (multiple shots on the same spot) of the layer. Accurate results for nickel layer and high errors for silver and gold layers were found with this calibration method.",
author = "T. K{\'a}ntor and L. Bez{\'u}r and E. Pungor and P. Fodor and J. Nagy-Balogh and Gy Heincz",
year = "1979",
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T1 - Determination of the thickness of silver, gold and nickel layers by a laser microprobe and flame atomic absorption technique

AU - Kántor, T.

AU - Bezúr, L.

AU - Pungor, E.

AU - Fodor, P.

AU - Nagy-Balogh, J.

AU - Heincz, Gy

PY - 1979

Y1 - 1979

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AB - Vapour-aerosol mixture generated by a laser beam was introduced into an acetylene air flame for atomic absorption detection. A laser chamber, injector and transport system are described, suitable for combination with any commercial laser-microprobe apparatus and atomic absorption spectrophotometer. Ruby laser with passive Q-switch was applied at max. 1000 J energy input, and the role of laser parameters and gas flow rates was studied using a silver plate as target. Copper sheets were electroplated with layers of varying thickness, analysed by conventional (solution) atomic absorption methods and used for the standardization of the solid sample method. With laser parameters appropriate for a complete evaporation of the layer by a single shot, calibration graphs close to a linear shape were found in 1-16 μm silver, 0. 5-8 μm gold and 1-12 μm nickel ranges. Peak absorbance measurements resulted in RSDs of 9.4% (silver), 8.4% (gold) and 14% (nickel) as averages for these ranges of thickness. At laser, flame and optical conditions of highest atomic absorption sensitivity, the approximate limits of detection were: 0.025 μm silver, 0.032 μm gold and 0.073 μm nickel. The accuracy of calibration based on microscopic measurement of the crater depth was investigated with laser parameters suitable for gradual evaporation (multiple shots on the same spot) of the layer. Accurate results for nickel layer and high errors for silver and gold layers were found with this calibration method.

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