Spectral resolution improvement in laser-induced breakdown spectroscopy through the generation of high-temperature and lowdensity plasmas

X. N. He, Z. Q. Xie, Y. S. Zhou, L. B. Guo, W. Hu, Y. F. Lu

Research output: Contribution to conferencePaper

Abstract

Spectral resolution improvement was achieved in laser-induced breakdown spectroscopy (LIBS) through generating high-temperature and low-density plasmas. The first pulse from a KrF excimer laser was used to produce particles by perpendicularly irradiating targets in open air. The second pulse from a 532 nm Nd:YAG laser was introduced parallel with the sample surface to reablate the particles. Optical scattering from the first-pulse plasmas was imaged to elucidate particle formation in the plasmas. Narrower line widths (full width at half maximums: FWHMs) and weaker selfabsorption were observed from time-integrated LIBS spectra. Numerical calculation of plasma temperatures and densities indicates that high temperature and low density can be achieved simultaneously in plasmas to improve LIBS resolutions. From the calculation, the temperature of the laser-induced plasmas from the reablation with the second pulse was as high as that of the first-pulse plasma. The temperature of the firstpulse plasma is ∼6400 K with a plasma density of ∼1.2×10 18 cm-3. The temperature of the reablation plasma, for instance, with an interpulse delay (the delay between the two pulses in dual-pulse LIBS (DPLIBS)) of 100 μs, was ∼6200 K. However, the plasma. density was ∼3.3×1017 cm-3, much lower than that of the first-pulse plasma.

Original languageEnglish (US)
Pages1315-1321
Number of pages7
DOIs
StatePublished - 2011
Event30th International Congress on Applications of Lasers and Electro-Optics, ICALEO 2011 - Orlando, FL, United States
Duration: Oct 23 2011Oct 27 2011

Conference

Conference30th International Congress on Applications of Lasers and Electro-Optics, ICALEO 2011
CountryUnited States
CityOrlando, FL
Period10/23/1110/27/11

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials

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    He, X. N., Xie, Z. Q., Zhou, Y. S., Guo, L. B., Hu, W., & Lu, Y. F. (2011). Spectral resolution improvement in laser-induced breakdown spectroscopy through the generation of high-temperature and lowdensity plasmas. 1315-1321. Paper presented at 30th International Congress on Applications of Lasers and Electro-Optics, ICALEO 2011, Orlando, FL, United States. https://doi.org/10.2351/1.5062223