Diagnostics of laser induced plasmas at late delay times

D'ANGELO, C. A.; MARTINO, L. J.

JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY

ROYAL SOC CHEMISTRY

Año: 2020 vol. 35 p. 1003 - 1010

0267-9477

The study of the diagnostics of plasmas produced by a laser is not always possible without enough data;usually a precise record of several lines meeting certain spectroscopic conditions is needed. In this work,a method for diagnosing plasmas was implemented at sufficiently late postbreakdown times, where it isno longer possible to apply known methods (e.g. Boltzmann plot for the estimation of kT), through aniterative algorithm that uses the parameters obtained by traditional methods at early times (LIBS typicaldelay time) and a minimum number of lines visible at the late times. Using the late times that are typicalto the plasma´s final life stage, evolution of the temperature and electronic density of the plasma isstudied. The LTE condition was also verified by McWhirter´s criterion.