Two-pulse laser fragmentation/laser-induced fluorescence of organophosphates traces

Bobrovnikov S.M., Gorlov E.V., Zharkov V.I., Murashko S.N.

For Russian citation (Opticheskii Zhurnal):

Бобровников С.М., Горлов Е.В., Жарков В.И., Мурашко С.Н. Двухимпульсная лазерная фрагментация/лазерно-индуцированная флуоресценция следов органофосфатов // Оптический журнал. 2025. Т. 92. № 2. С. 106–115. http://doi.org/10.17586/1023-5086-2025-92-02-106-115

Bobrovnikov S.M., Gorlov E.V., Zharkov V.I., Murashko S.N. Two-pulse laser fragmentation/laser-induced fluorescence of organophosphates traces [in Russian] // Opticheskii Zhurnal. 2025. V. 92. № 2. P. 106–115. http://doi.org/10.17586/1023-5086-2025-92-02-106-115

For citation (Journal of Optical Technology):

Abstract:

Subject of study. Laser-induced fluorescence of products of laser fragmentation of organophosphates. Aim of study. Determination of the dynamic characteristics of the process of laser fragmentation of droplet-liquid traces of organophosphate on the surface. Method. Laser fragmentation of organophosphates followed by laser excitation of fluorescence of their characteristic PO-fragments (phosphorus oxide molecules). A consistent increase in the time interval between the moments of exposure to the fragmenting and probing pulses will make it possible to trace the dynamics of the formation of fragments by the intensity of their fluorescence. Main results. Using the example of traces of triethyl phosphate on a paper surface, it is shown that the process of formation of POfragments is inertial in nature. The formation of the maximum number of fragments is observed approximately 2 μs from the moment of exposure to the fragmenting laser pulse (266 nm). It has been established that when the probing laser pulse (247.78 nm) is delayed relative to the fragmenting pulse by 2 μs, it leads to a multiple increase in the fluorescence intensity: approximately 9 times compared to the single-pulse excitation method and approximately 2.3 times with simultaneous two-pulse exposure. Practical significance. The results obtained in this work can be used to create lidar systems for detecting traces of organophosphates on the surfaces of objects.

Keywords:

organophosphates, laser fragmentation, phosphorus oxide, PO-fragments, laserinduced fluorescence

Acknowledgements:

this work was supported by the Russian Science Foundation, Project № 20-79-10297, https://rscf.ru/project/20-79-10297/

OCIS codes: 300.2530, 300.6500, 300.6540

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