Open AccessInfluence of CO_2 pressure on the emission spectra and plasma parameters in underwater laser-induced breakdown spectroscopy
Author(s) -
Christian L. Goueguel,
Dustin McIntyre,
Jinesh C. Jain
Publication year - 2016
Publication title -
optics letters/optics index
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.524
H-Index - 272
eISSN - 1071-2763
pISSN - 0146-9592
DOI - 10.1364/ol.41.005458
Subject(s) - materials science , electron density , emission spectrum , laser induced breakdown spectroscopy , plasma , electron temperature , laser , atomic physics , spectroscopy , stark effect , spectral line , plasma diagnostics , plasma parameters , optics , analytical chemistry (journal) , physics , chemistry , quantum mechanics , astronomy , chromatography
Optical emission spectroscopic studies have been carried out to investigate the pressure effect of CO 2 on laser-produced underwater plasma. The plasma was generated by focusing 1064 nm, 6 ns pulses from a Nd:YAG laser in a CO 2 -bearing solution. The temporal evolution of the continuum emission, Sr and Ba lines, and plasma electron density and temperature was characterized under CO 2 pressure ranging from 10 to 300 bars. The electron density measurements were made using the Stark broadening of the 455.40 nm Ba II line, while the temperature measurements have been performed by the Saha-Boltzmann method using the Sr I-II lines at 460.73 and 407.77 nm, respectively. It was found that CO 2 pressure has little effect on the emission line intensity and signal-to-background ratio. The electron density and the temperature are found to be independent of the CO 2 pressure at early times. When time becomes longer, the electron density exhibits an appreciable rise as the CO 2 pressure increases, while the temperature is found to be unchanged.