ИСТИНА

Laser-induced breakdown spectrometry is typically utilized for qualitative or quantitative analysis of a sample. Over the last two decades, there has been a marked increase in the number of publications devoted to utilizing the technique for analytical purposes. Besides this, there are numerous areas where the emission of laser-induced plasma (LIP) can be employed to address particular problems. Our primary focus is on such non-analytical applications, including fundamental studies of laser plasma itself, determination of atomic line parameters, and laboratory modeling of emission from cosmic objects. To accurately determine fundamental parameters, it is essential to accurately study the plasma source. Consequently, considerable effort has been directed towards evaluating the presence of equilibrium through comparison of translational, excitation, vibrational, and rotational temperatures at various pressures as well as studying the particle distribution in laser plasmas, including employing probing techniques. Among the non-analytical applications of laser plasma, it is primarily desirable to begin with the determination of Stark parameters due to the relatively straightforward operations with LIP. Generating a long plasma (“long spark”) instead of a spherical plasma can provide a significant improvement in Stark parameter measurements, allowing for accurate estimation of ion broadening, the impact of hyperfine splitting on profile shapes, and measuring Stark broadening parameters even for resonance lines. A significant challenge in studying the processes related to the entry of celestial bodies into the upper layers of the Earth's atmosphere is the interpretation of molecular bands, particularly FeO (its theoretical modeling is impossible). Laser plasma has proven to be a beneficial source for laboratory modeling of these processes. Specifically, laboratory spectra have been found to be considerably more accurate than chemiluminescent spectra when compared against meteor event data. Additionally, we discovered substantial discrepancies between laser plasma spectra and the spectra of the Beneshev bolide obtained at corresponding pressures: a similar profile is formed at pressures that are 7-10 times higher than the corresponding height during a bolide's atmospheric passage. Thus, laboratory modeling can be employed to assess pressure during various events in atmosphere accompanied by plasma formation. Another pressure-depending effect was that the intensity of the CaO band rapidly increases with growing pressure, while the intensity of the FeO band is practically independent of pressure. This leads us to believe that CaO formation in plasma primarily occurs using atmospheric oxygen, while FeO originates from the target material and we can conclude that laser plasma may be also useful for revealing of meteor burning mechanisms.