"This thesis has shown the feasibility of measuring both low-frequency Raman and Laser-Induced Breakdown Spectra in a single instrument. On the other hand Elemental identification is the basis of any chemical analysis but until now, the available methodologies for processing LIBS signals required a great deal of effort to implement and not always provide adequate results. The proposed Wavelength Similarity Coefficient method could change this scenario because it is a straightforward method based in some often overlooked facts, as the temperature dependence of the spectral line relevance and the use of a simplified modeling for the plasma’s line heights. Finally, obtaining the individual emission line parameters form the measured spectrum is a fundamental step in the quantitative analysis. A new approach was introduced in this work, aimed to solve some drawbacks of the Levenberg-Marquardt method, as the convergence and line energy overestimates, which potentially leads to wrong elemental composition."