Laser desorption of traces of low volatile explosives

5th International Conference of Photonics and Information Optics

Akmalov, A.E.^1 ; Chistyakov, A.A.^1 ; Kotkovskii, G.E.^1

National Research Nuclear University MEPhI, Moscow Engineering Physics Institute, 31 Kashirskoe shosse, Moscow

115409, Russia^1

关键词: Analytes;    Cyclotrimethylenetrinitramine (RDX);    E-pulse;    Laser desorption;    Laser sources;    Laser-based;    Quartz substrate;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/737/1/012039/pdf
DOI  :  10.1088/1742-6596/737/1/012039

来源: IOP

【 摘 要 】

Comparison of desorption effectiveness of two laser sources: continuous diode laser (λ = 440 nm, P = 0.5 W) and laser based on YAG: Nd3+ (X = 266 nm, τpulse= 6 ns, Epulse= 1.0 mJ, f = 10 Hz, Ipulse= 108W/cm2) was carried out for the explosive cyclotrimethylenetrinitramine (RDX). The results of mass spectrometric studies of RDX laser desorption from a quartz substrate are discussed. It is shown that a continuous diode laser (λ = 440 nm) effectively desorbs the analyte without accompanying dissociation. The typical desorbed mass is 70 ng for RDX at 1.1 minutes exposure. However a laser based on YAG: Nd3+seems to be more efficient for the same time exposure.