Diode laser-aided diagnostics of a low-pressure dielectric barrier discharge applied in element-selective detection of molecular species

Sample Analysis with Miniaturized Plasmas

“…In this thin layer the electron density reaches a concentration of 10 15 cm Ϫ3 and a gas temperature of about 1000 K, while the rest of the discharge remains cold. 46 The mean power consumption of the discharge is much smaller than 1 W. The slopes of the applied rectangular voltage (e.g., 10 kHz) induce a short current pulse and therefore the halfwidth of the current pulse is only a tenth of the whole plasma cycle. Furthermore, the highest atom density is localized in about a tenth of the discharge volume.…”

Spatially resolved argon microplasma diagnostics by diode laser absorption

“…Several such methods have been reported for electron density, 2-5 gas temperature, 2,4,6-8 and excited state density. [9][10][11] Diode laser absorption is one method used to measure the density of particular atoms and molecules. A single-mode ͑SM͒ diode laser emits in a narrow linewidth on the order of 10 −14 m. This is much less than the Doppler broadening of the absorption profile ͑ϳ10 −12 m͒, so the method's instrumental broadening is negligible.…”

“…This makes it possible to analyze the absorption lineshape and extract gas temperature in addition to the estimation of the species density. Laser absorption has been applied to both low pressure 12,13 and high pressure 6,9,11,[14][15][16] plasmas by various research groups.…”

Determination of Se, Pb, and Sb by atomic fluorescence spectrometry using a new flameless, dielectric barrier discharge atomizer

“…Several plasma sources have been explored, including the microwave induced plasma(MIP) [21][22][23], the capacitively coupled plasma (CCP) [24], the inductively coupled plasma(ICP) [25], the glow discharge(GD) [26], and the dielectric barrier discharge(DBD) [27,28]. Microplasmas have many advantages: small size, low gas and power consumption, and the relatively low manufacturing cost.…”

“…A few studies on the use of a DBD in analytical spectrometry have been reported recently. Niemax and coworkers [27,28] have explored a low pressure DBD in conjunction with diode laser atomic absorption spectrometry for the decomposition of chlorofluocarbons and detection of Cl and F. The DBD has also been investigated as a detector for gas chromatography by Gras et al [30]. In our previous studies [31,32], a low temperature atomizer for AAS, based on the DBD, was proposed for hydride-forming elements detection.…”