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Título

Time characterization of the laser ablation plasma plume of CaO produced by a pulsed infrared TEA-CO2 laser

Autor Cid, J.P.; Camacho, J.J.; Díaz Sol, Luis ; Oliver, V.; Poyato, J.M.L.
Fecha de publicación 9-jul-2014
EditorUniversidad de La Rioja
Citación XXIV RNE-VIII CIE Espectroscopía, Logroño, 9-11 de julio (2014)
ResumenTime characterization of the laser ablation plasma plume of CaO produced by a pulsed infrared TEA-CO2 laser J.P. Cid1,2, J.J. Camacho1, L. Diaz3, V.Oliver1, J.M.L. Poyato1. (1) Departamento de Química-Física Aplicada, Universidad Autónoma de Madrid, Cantoblanco 28049 Madrid, Spain, juanpablo.cid@uam.es. (2) Servicio de Conservación, Restauración y Estudios Científicos del Patrimonio Arqueológico, Universidad Autónoma de Madrid, Cantoblanco 28049, Madrid, Spain. (3) Instituto de Estructura de la Materia, CFMAC, CSIC, Serrano 121, 28006 Madrid, Spain. The underlying physics of laser ablation remains incompletely understood due to complex laser-target and laser-plasma interactions, plasma expansion and confinement, plasma condensation interaction processes. The experimental setup and equipment used has been described elsewhere [1]. The laser beam form a transversely excited atmospheric (TEA) CO2 pulsed-laser was focused onto a CaO target. The laser induced plasma was imaged 1:1 onto the entrance slit of different spectrometers. For time-resolved measurements, the detectors are synchronized with the trigger of the laser pulse. A Dove prism was inserted between to lenses into the observation optical path for rotating ¿/2 rad the plasma image for recording 2D spectral images. The spatio-temporal evolution of the calcium oxide plasma produced by a high-power pulsed TEA-CO2 laser has been investigated using optical emission spectroscopy (OES) and imaging methods. The emission observed in the plasma region is mainly due to electronic relaxation of excited Ca, Ca+, Ca2+, O, O+ and CaOH fragments. Time-integrated and time-resolved two-dimensional OES plasma profiles were recorded as function of emitted wavelength and distance from the target. The temperature measurements have been performed by Boltzmann diagram method. The temporal behaviour of specific emission lines of the species was characterized. The results show faster decays for continuum and Ca2+ species than for Ca+ and Ca. The Stark broadening of isolated calcium emission lines was employed for deducting the electron densities.
Descripción XXIV Reunión Nacional de Espectroscopia-VIII Congreso Ibérico de Espectroscopia; organizan Sociedad de Espectroscopia Aplicada (SEA) y Universidad de La Rioja. P094
URI http://hdl.handle.net/10261/110761
Aparece en las colecciones: (CFMAC-IEM) Comunicaciones congresos
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