Detection of explosives by plasma optical emission spectroscopy

Impact on the Gas Barrier Property of Silicon Oxide Films Prepared by Tetramethylsilane-Based PECVD Incorporating with Ammonia

“…In contrast, when ammonia gas was introduced into the gas mixture, the dominating emission lines over the OES spectrum ( Figure 1b) were quite different from those of the glow discharge of the TMS-O 2 gas mixture. As referred to in the inset OES spectrum of Figure 1b, measured from the pure ammonia plasma, the peaks at about 314, 335, 356, and 390 nm were attributed to the transition lines of the nitrogen molecules (N 2 ) and the ions of the nitrogen molecules (N 2 + ) [23,24]. The emission peaks at 426, 485, and 655 nm, in turn, corresponded to the molecular and atomic emissions of excited H 2 , H β , H α [20,25].…”

“…The emission peaks at 426, 485, and 655 nm, in turn, corresponded to the molecular and atomic emissions of excited H 2 , H β , H α [20,25]. Furthermore, a significant peak at about 387 nm emerged from the CN * /CH transition [24,26]. Based on the above-mentioned analyses, the oxygen-related plasma lines as well as the emission lines that emerged from the dissociation and oxidation between the oxygen and TMS monomer, such as SiO, CO, and OH species, were the main fingerprints determined from the OES spectrum recorded from the TMS-O 2 glow discharge.…”

Direct microplasma analysis of coals and sorbents for C, H, N, S and mineral element concentrations

“…Rather than laser or micro-drilling through refractory metal foils [59], or using a screenprinting process [60][61][62], a capillary metal tube functioned as the anode. It was fixed in place while the planar cathode could be axially translated to vary the inter-electrode spacing.…”

Atomic spectrometry update. Review of advances in the analysis of metals, chemicals and functional materials

“…Although preconcentration methods add a level of complexity and remove much of the ability for remote analysis, Fujiyama-Novak et al 82 employed a preconcentration/separation system coupled to a micro-hollow glow discharge (MHGD) plasma detector for the analysis of explosives. Separation eliminated air interferences and preconcentration yielded detection limits of less than 5 ppb for triacetate peroxide and dinitrotoluene.…”