Temporal evolution study of the plasma induced by CO2 pulsed laser on targets of titanium oxides |
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| Institution: | 1. Instituto de Estructura de la Materia, CFMAC, CSIC, Serrano 121, 28006-Madrid, Spain;2. Departamento de Química-Física Aplicada, Facultad de Ciencias, Universidad Autónoma de Madrid, Cantoblanco, 28049-Madrid, Spain;3. Instituto de Química Física Rocasolano, CSIC, Serrano 119, 28006-Madrid, Spain;4. Laboratory of Laser Chemistry, Institute of Chemical Process Fundamentals, ASCR, 16502 Prague, Czech Republic |
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| Abstract: | 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, 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. |
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