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CN and C2 vibrational spectra analysis in molecular LIBS of organic materials

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Abstract

With the objective of investigation of the influence of molecular structure on CN violet and C2 Swan bands system spectra, plasma emissions from different organic materials, including polycyclic aromatic hydrocarbons, aromatic carboxylic acid, aliphatic carboxylic acid, amides and polymers, have been analyzed by laser-induced breakdown spectroscopy (LIBS) technique in air. To evaluate the influence of N2 and O2 molecules concentration on the CN and C2 molecular emissions, LIB spectra of four different samples have been recorded in air (approximately 80 % N2 and 20 % O2), nitrogen, oxygen and argon atmospheres. Experimental results indicate that the main reason for the absence of C2 emission in LIB spectra of samples which do not contain C–C bonds, when measurements were taken in air, is the presence of oxygen which could potentially deplete C2 emission rather than the absence of C–C bonds in their structure. Also, comparisons between experiment and theory spectra are made using a Nelder–Mead temperature program for CN and C2 bands with the ∆ν = 0 sequences from LIB spectra of different samples in various atmospheres. Furthermore, CN and C2 vibrational temperatures in Kelvin (K) are calculated from these spectral fittings. Both CN and C2 vibrational temperatures have highest values in argon atmosphere, and increasing the oxygen concentration in ambient atmosphere decreased those in most cases.

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Acknowledgments

Hereby, we would like to acknowledge Malek Ashtar Optics and Laser Science and Technology Research Center for supplying the equipment used in the present study. We also thank Dr. James O. Hornkohl from University of Tennessee Space Institute for providing us the NMT code.

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Authors and Affiliations

  1. Department of Physics, University of Isfahan, Isfahan, Iran

    S. J. Mousavi & M. Soltanolkotabi

  2. Optics and Laser Science and Technology Research Center, Malek-Ashtar University of Technology, P.O. Box 83145/115, Shahin Shahr, Islamic Republic of Iran

    S. J. Mousavi, M. Hemati Farsani, S. M. R. Darbani & A. Eslami Majd

  3. Department of Chemistry, Malek-Ashtar University of Technology, P.O. Box 83145/115, Shahin Shahr, Islamic Republic of Iran

    A. Mousaviazar

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  1. S. J. Mousavi
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Correspondence to S. J. Mousavi.

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Mousavi, S.J., Hemati Farsani, M., Darbani, S.M.R. et al. CN and C2 vibrational spectra analysis in molecular LIBS of organic materials. Appl. Phys. B 122, 106 (2016). https://doi.org/10.1007/s00340-016-6371-6

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  • DOI: https://doi.org/10.1007/s00340-016-6371-6

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