Temporal Evolution Study of the Plasma Induced by CO2 Pulsed Laser on Targets of Titanium Oxides

0397650 - ÚCHP 2014 RIV NL eng J - Journal Article
Diaz, L. - Camacho, J.J. - Sanz, M. - Hernández, M. - Jandová, Věra - Castillejo, M.
Temporal Evolution Study of the Plasma Induced by CO2 Pulsed Laser on Targets of Titanium Oxides.
Spectrochimica Acta Part B: Atomic Spectroscopy. Roč. 86, AUG 1 (2013), s. 88-93. ISSN 0584-8547. E-ISSN 1873-3565
Grant - others:DGICYT(ES) CTQ2008-05393/BQU; DGICYT(ES) CTQ2010-15680/BQU; CAM(ES) Geomateriales S2009/
Institutional support: RVO:67985858
Keywords : laser induced breakdown spectroscopy * time-resolved optical emission spectroscopy * high-power IR CO2 pulsed laser
Subject RIV: CH - Nuclear ; Quantum Chemistry
Impact factor: 3.150, year: 2013

This paper reports studies on time-resolved laser induced breakdown spectroscopy (LIBS) of plasmas induced by IR nanosecond laser pulses on the titanium oxides TiO and TiO2 (anatase). LIBS excitation was performed using a CO2 laser. The laser-induced plasma was found strongly ionized yielding Ti+, O+, Ti2+, O2+, Ti3+, and Ti4+ species and rich in neutral titanium and oxygen atoms. The temporal behavior of specific emission lines of Ti, Ti2+ and Ti3+ was characterized. The results show a faster decay of Ti3+ and Ti2+ ionic species than that of Ti+ and neutral Ti atoms. Spectroscopic diagnostics were used to determine the time-resolved electron density and excitation temperatures. Laser irradiation of TiO2-anatase induces on the surface sample the polymorphic transformation to TiO2-rutile. The dependence on fluence and number of irradiation pulses of this transformation was studied by micro-Raman spectroscopy.
Permanent Link: http://hdl.handle.net/11104/0225271