Kinetic Model of C/H/N/O Emissions in Laser-Induced Breakdown Spectroscopy of Organic Compounds

Abstract

A kinetic model to predict the relative intensities of the atomic C/H/N/O emission lines in laser-induced breakdown spectroscopy (LIBS) has been developed for organic compounds. The model includes a comprehensive set of chemical processes involving both neutral and ionic chemistry and physical excitation and de-excitation of atomic levels affecting the neutral, ionic, and excited-state species concentrations. The relative excited-state atom concentrations predicted by this modeling are compared with those derived from the observed LIBS intensities for 355nm ns laser irradiation of residues of two organic compounds on aluminum substrate. The model reasonably predicts the relative excited-state concentrations, as well as their time profiles. Comparison of measured and computed concentrations has also allowed an estimation of the degree of air entrainment.

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Document Details

Document Type
Technical Report
Publication Date
May 01, 2010
Accession Number
ADA519518

Entities

People

  • Ani Khachatrian
  • Paul J. Dagdigian
  • Valeri I. Babushok

Organizations

  • Johns Hopkins University

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Air Entrainment
  • Chemical Compounds
  • Chemistry
  • Detection
  • Electron Density
  • Electrons
  • Emission
  • Laser Pulses
  • Laser-Induced Breakdown Spectroscopy
  • Materials
  • Measurement
  • Organic Compounds
  • Simulations
  • Spectra
  • Spectroscopy
  • Time Dependence
  • Two Dimensional

Fields of Study

  • Physics

Readers

  • Analytical Chemistry
  • Pulsed Power and Plasma Physics.

Technology Areas

  • Directed Energy
  • Directed Energy - Lasers