Experimental Estimation of the Efficiency of Approaches to Excitation of Anti-Stokes Fluorescence of PO-photofragments of Organophosphates from the First Excited Vibrational State X²Π (\({v}{\kern 1pt} ''\) = 1)

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发表日期：

2025年12月1日

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

摘要

Abstract

The paper discusses approaches to increasing the noise immunity of the laser fragmentation/laser-induced fluorescence (LF/LIF) method in remote detection of surface traces of organophosphates. A possibility of inducing anti-Stokes fluorescence of PO-fragments (phosphorus oxide molecules) of organophosphates from the first excited vibrational state X ²Π ( \({v}{\kern 1pt} ''\) = 1) to the electronically excited state A²Σ⁺ ( \({v}{\kern 1pt} '\) = 0) by laser radiation at wavelengths of 253.891, 254.021, 255.337, and 255.484 nm near the bandheads of the branches (Q₁₁ + P₂₁), P₁₁, (P₂₂ + Q₁₂), and P₁₂, respectively, was experimentally shown. Using the example of drop-liquid traces of triethyl phosphate on a paper surface, it was determined that excitation of P₁₂ branch lines forming the bandhead ensures the highest noise immunity of the LF/LIF method for detecting organophosphates. The results can be used to select the optimal technique for excitation of fluorescence of PO-fragments in the practical implementation of the LF/LIF method for remote detection of organophosphate traces.

Experimental Estimation of the Efficiency of Approaches to Excitation of Anti-Stokes Fluorescence of PO-photofragments of Organophosphates from the First Excited Vibrational State X2Π (\({v}{\kern 1pt} ''\) = 1)

摘要

Experimental Estimation of the Efficiency of Approaches to Excitation of Anti-Stokes Fluorescence of PO-photofragments of Organophosphates from the First Excited Vibrational State X²Π (\({v}{\kern 1pt} ''\) = 1)