2026-05-27T05:29:58Zhttps://riuma.uma.es/rest/oai/request

oai:riuma.uma.es:10630/455752026-02-20T00:45:36Zcom_10630_2254col_10630_37953

00925njm 22002777a 4500 dc Delgado-Pérez, Tomás author Vadillo-Pérez, José Miguel author Laserna-Vázquez, José Javier author 2014 The influence of the ambient atmosphere on the dynamics of plasma expansion, besides the interaction between excited plasma and gas molecules, has been studied for specific organic aromatic compounds. To analyze the influence of air on the formation pathways of atomic and molecular species inside the plasma plume, the spectral emissions in laser-induced breakdown spectroscopy (LIBS) of 2,4,6-trinitrotoluene (TNT) and pyrene were compared at different pressure environments, from high vacuum to atmospheric pressure. Pelletized samples of the compounds were introduced in a vacuum chamber for excitation with the fourth harmonic output of an Nd:YAG laser (266 nm). The optical emission signal was collected with an optical fiber connected to a spectrograph fitted with a intensified charge-coupled device detector. Results from LIBS spectra indicate that changes in pressure level affect the kinetics of the characteristic excited species and their spatial distribution inside the plasma plume. Delgado T, Vadillo JM, Laserna JJ. Pressure Effects in Laser-Induced Plasmas of Trinitrotoluene and Pyrene by Laser-Induced Breakdown Spectroscopy (LIBS). Applied Spectroscopy. 2014;68(1):33-38. doi:10.1366/13-07164 https://hdl.handle.net/10630/45575 10.1366/13-07164 Plasmas producidos por láser Pressure Effects in Laser-Induced Plasmas of Trinitrotoluene and Pyrene by Laser-Induced Breakdown Spectroscopy (LIBS)