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On the determination of plasma electron number density from Stark broadened hydrogen Balmer series lines in Laser-Induced Breakdown Spectroscopy experiments

Abstract: In this work, different theories for the determination of the electron density in Laser-Induced Breakdown Spectroscopy (LIBS) utilizing the emission lines belonging to the hydrogen Balmer series have been investigated. The plasmas were generated by a Nd:Yag laser (1064 nm) pulsed irradiation of pure hydrogen gas at a pressure of 2 · 104 Pa. Ha, Hb, Hy, Hd, and He Balmer lines were recorded at different delay times after the laser pulse. The plasma electron density was evaluated through the measurement of the Stark broadenings and the experimental results were compared with the predictions of three theories (the Standard Theory as developed by Kepple and Griem, the Advanced Generalized Theory by Oks et al., and the method discussed by Gigosos et al.) that are commonly employed for plasma diagnostics and that describe LIBS plasmas at different levels of approximations. A simple formula for pure hydrogen plasma in thermal equilibrium was also proposed to infer plasma electron density using the Ha line. The results obtained showed that at high hydrogen concentration, the Ha line is affected by considerable self-absorption. In this case, it is preferable to use the Hb line for a reliable calculation of the electron density.

 Autoría: Pardini L., Legnaioli S., Lorenzetti G., Palleschi V., Gaudiuso R., De Giacomo A., Diaz Pace D.M., Anabitarte Garcia F., De Holanda Cavalcanti G., Parigger C.,

 Fuente: Spectrochimica Acta - Part B Atomic Spectroscopy, 2013, 88, 98-103

 Editorial: Elsevier

 Fecha de publicación: 01/10/2013

 Nº de páginas: 6

 Tipo de publicación: Artículo de Revista

 DOI: 10.1016/j.sab.2013.05.030

 ISSN: 0584-8547,1873-3565

 Url de la publicación: https://doi.org/10.1016/j.sab.2013.05.030

Autoría

PARDINI, LORENZO

LEGNAIOLI, STEFANO

LORENZETTI, GIULIA

PALLESCHI, VINCENZO

GAUDIUSO, ROSALBA

DE GIACOMO, ALESSANDRO

DÍAZ PACE, DIEGO M.

FRANCISCO ANABITARTE GARCIA

HOLANDA CAVALCANTI, GILDO DE

PARIGGER, CHRISTIAN G.