29 May 2013 Femtosecond LIBS studies of nitropyrazoles
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We present our initial experimental results from the LIBS studies of pyrazole, 1-nitropyrazole, 3-nitropyrazole, 3,4- dinitropyrazole and 1-methyl- 3,4,5 trinitro pyrazole recorded with femtosecond pulses and performed in argon atmosphere. CN molecular bands in three different spectral regions of 357 nm-360 nm, 384 nm-389 nm and 414 nm -423 nm, C2 swan bands near 460 nm-475 nm, 510 nm– 520 nm and 550 nm-565 nm were observed. The C peak at 247.82 nm, H peak at 656.2 nm have also been observed along with several peaks of O and N. CN/C2, CN/C, C2/C and C2/N ratios were measured from the average of 25 spectra obtained in argon. The effect of number of nitro groups on the atomic and molecular emission has been evaluated. A gate delay of 100 ns and a gate width of 800 ns were used for collecting the spectra.
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E. Nageswara Rao, E. Nageswara Rao, Sreedhar Sunku, Sreedhar Sunku, Surya P. Tewari, Surya P. Tewari, G. Manoj Kumar, G. Manoj Kumar, S. Venugopal Rao, S. Venugopal Rao, "Femtosecond LIBS studies of nitropyrazoles", Proc. SPIE 8710, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XIV, 87101O (29 May 2013); doi: 10.1117/12.2015760; https://doi.org/10.1117/12.2015760

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