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Spatially resolved studies of laser-induced plasma by a two-line fluorescence thermometryстатья Исследовательская статья
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 4 марта 2026 г.
- Авторы: Beglaryan Babken G., Zakuskin Aleksandr S., Popov Andrey M., Labutin Timur A.
- Журнал: Spectrochimica Acta - Part B: Atomic Spectroscopy
- Том: 235
- Год издания: 2026
- Издательство: Elsevier BV
- Местоположение издательства: Netherlands
- Номер статьи: 107381
- DOI: 10.1016/j.sab.2025.107381
- Аннотация: A laser-induced fluorescence (LIF) thermometry technique was developed for spatially resolved diagnostics of laser-induced plasma (LIP). The method adapts the two-line fluorescence approach by using two independent three-level excitation schemes of Ti I. Analysis of excitation–relaxation kinetics shows that, under typical experimental conditions, absorption and stimulated emission rates exceed spontaneous decay by several orders of magnitude, enabling rapid fluorescence saturation. An analytical expression was derived that relates the ratio of saturated fluorescence intensities from two schemes to the plasma temperature. Two Ti I schemes, a3P2 → x3P°1 → a3P0 (Scheme A) and z5G°5 → e5G6 → z5F°5 (Scheme B), were implemented, producing stable signals with substantial enhancement over spontaneous emission at 405.501 and 403.051 nm, respectively. Using these schemes, a two-dimensional temperature distribution of the central plasma cross-section was obtained with high spatial resolution. The temperature near the plasma axis (radius of 2 mm) was ≈4000 K, increasing to 6000–8000 K in the periphery, forming a pronounced radial gradient. The occurrence of this high-temperature zone coincides with regions influenced by shock-wave propagation, suggesting two possible mechanisms: direct shock-wave heating and the transport of excited particles with the wave front.
- Добавил в систему: Лабутин Тимур Александрович
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