Abstract
Spatial distributions of temperature and relative number densities of Fe neutral atoms and ions in a laser-induced plasma have been measured by time- and space-resolved emission spectroscopy. The deconvolution of the intensity spectra has been carried out to obtain the local emissivity of neutral atom and ion lines as a function of the axial (z) and radial (r) coordinates. The plasma was generated with a Fe-Ni-Al alloy in air at atmospheric pressure using a Nd:YAG laser. The distributions present a dark region with negligible neutral atom and ion emissivities and densities, situated close to the sample surface at axial distances z≤1 mm. In the emitting region, the temperature has its maximum at the plasma axis (16000 K) and shows a monotonous decrease towards the border (6000 K). The neutral atoms and ions occupy regions corresponding to a great extent to different radial positions. At an axial distance z=1.8 mm, at which the maximum emissivities are produced, the maximum of the ion density is at r≅0.6 mm, whereas the neutral atom density maximum is at r≅1.3 mm.
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A.D. Sappey, N.S. Nogar: In Laser Ablation. Principles and Applications, ed. by J.C. Miller (Springer-Verlag, Berlin 1994) p. 157
R.A. Multari, L.E. Foster, D.A. Cremers, M.J. Ferris: Appl. Spectrosc. 50, 1483 (1996)
B.C. Castle, K. Visser, B.W. Smith, J.D. Winefordner: Appl. Spectrosc. 51, 1017 (1997)
D.B. Geohegan, D.N. MashBurn: Appl. Phys. Lett. 55, 2345 (1989)
A.D. Sappey, T.K. Gamble: Appl. Phys. B 53, 353 (1991)
A.D. Sappey, T.K. Gamble: J. Appl. Phys. 72, 5095 (1992)
J.A. Aguilera, C. Aragón, J. Bengoechea: Appl. Opt. 42, 5938 (2003)
J.A. Aguilera, J. Bengoechea, C. Aragón: Spectrochim. Acta Part B 59, 461 (2004)
NIST Atomic Spectra Database, http: //physics.nist.gov
C. Colón, G. Hatem, E. Verdugo, P. Ruiz, J. Campos: J. Appl. Phys. 73, 4752 (1993)
S. Freudenstein, J. Copper: Astron. Astrophys. 71, 283 (1979)
A. Thorne, U. Litzén, S. Johansson: Spectrophysics: principles and applications (Springer-Verlag, Berlin 1999) p. 221
H.R. Griem: Principles of Plasma Spectroscopy (Cambridge University Press, Cambridge 1997) p. 280
Y.W. Kim: In Laser-induced Plasmas and Applications, ed. by L.J. Radziemski, D.A. Cremers (Marcel Dekker, New York 1989) p. 329
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52.70.kz; 52.50.Jm; 52.38.Mf
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Aragón, C., Peñalba, F. & Aguilera, J. Spatial characterization of laser-induced plasmas: distributions of neutral atom and ion densities. Appl. Phys. A 79, 1145–1148 (2004). https://doi.org/10.1007/s00339-004-2689-8
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DOI: https://doi.org/10.1007/s00339-004-2689-8