Vol. 34, issue 10, article # 2

Bаbushkin P. A., Matvienko G. G., Oshlakov V. K. Determination of the elemental composition of aerosol by femtosecond laser-induced breakdown spectroscopy. // Optika Atmosfery i Okeana. 2021. V. 34. No. 10. P. . DOI: 10.15372/AOO20211002 [in Russian].
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Abstract:

Information about an angular distribution of emission from the filamentation region is required to select an effective scheme for remote sensing of the aerosol atmosphere by femtosecond laser-induced breakdown spectroscopy.
We present the results of a series of experiments on identification of an impurity with the use of femtosecond LIBS. The angular distribution of the emission from the femtosecond radiation filamentation region in the atmosphere for an impurity in water aerosol is estimated in the range from 0 to 180° based on the experimental data. A model of the angular distribution of the emission is suggested, where absorption in the filament plasma is taken into account. The variation in the intensity of the emission line with the impurity concentration is analyzed. It is shown that emission from the filamentation region occurs due to spontaneous emission.

Keywords:

femtosecond, lidar, aerosol, plasma, emission, FS-LIBS

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