Argon plasma jet

Aluminum, silicon and zinc were determined by d.c.-argon plasma jet emission spectrophotometry. 

Figure 16.6 Typical optical emission spectra of (a) helium plasma jet and (b) argon plasma jet, the spectra was obtained at an axial position 2.7 cm from the jet inlet conditions are (a) 3000 seem helium, 1.35 kW, and 89 Pa (b) 2000 seem argon, 0.64 kW, and 75 Pa.

Table 16.3 Spectra Emitted in Argon Plasma Jet with Addition of Reactive Gases...

Figure 16.8 Typical emission spectra of nitrogen in low temperature cascade arc plasma jets (a) N2 in helium plasma jet, (b) N2 in argon plasma jet.

Figure 16.10 Typical emission spectra of 60 seem N2 (a) in helium plasma jet, (b) RF plasma of pure N2, 10 Pa, RF power SOW, (c) in argon plasma jets.

Figure 16.11 The dependence of emission argon lines and nitrogen 2nd pos. band (337.1 nm) emission intensities at an axial position 2.7 cm from jet inlet on the flow rate of nitrogen added to argon plasma jet. Conditions are 2000 seem argon, 60 seem nitrogen, 75 Pa, 0.64 kW.

When oxygen was added to an argon plasma jet at 60 seem, neither obvious quenching of argon emission nor color change of the plasma jet was observed. The emission due to Ar atoms dominated the spectrum. However, the optical emissions due to excited oxygen atoms at 777.2 nm (E 10.7 eV) and 844.6 nm (E 11.0 eV) were clearly observed. 

When ammonia gas was introduced into an argon plasma jet at a flow rate of 60 seem, all argon emission lines disappeared, and a very short but brilliant light-blue flame was formed. A very strong NH emission band was observed. In the ammonia radio frequency plasma, some very weak N2 emission bands due to N2 second positive appeared, but in the ammonia flame formed in an argon plasma jet no emission related to N2 species was observed. 

Figure 16.15 The optical emission spectra of argon plasma jets (a) with addition of 10 seem nitrogen and 10 seem hydrogen, (b) with addition of 60 seem nitrogen and 2.7 seem hydrogen, and (c) with pure nitrogen addition, 60 seem nitrogen. The other conditions are 2000 seem argon, 0.64 kW, and 75 Pa.

The interstitial carbides are infusible, unreactive substances. Some temperatures of the onset of decomposition have been estimated using an argon plasma jet. Values reported [36] for WC, TaC and NbC are 4000, 4400 and 7000 K, respectively. 

Table 3 Spectra emitted in argon plasma jet with addition of reactive gases...

When oxygen was added into an argon plasma jet at 60 seem, neither obvious quenching of argon emission... 

When hydrogen gas was introduced into argon plasma jet, all the argon emissions were strongly quenched and a very short and brilliant flame with a light blue color was formed. The emissions from excited hydrogen atoms (E 12 eV) and molecules (E 11.8eV) were... 

When ammonia gas was introduced into an argon plasma jet at a flow rate of 60 seem, all argon emission lines disappeared, and a very short but brilliant light blue flame was formed. A very strong NH emission... 

Fusselman, S.P Yasuda, H. An overall mechanism for the deposition of plasma polymers from methane in a low-pressure argon plasma jet. Plasma Chem. Plasma Process. 1994, 14, 251. 

Fig. 3. Argon plasma jet with water-cooled annulus for methane pyrolysis. (Redrawn from Leutner, H. W., Stokes, C S. Ind. Eng. Chem. 53, 341 (1961), by permission of the authors and the publishers, the American Chemical Society)...

Graves, Kawa, and Hiteshue (6) reported investigations using bituminous coal fed into an argon plasma jet. Acetylene, the principle product, was obtained in yields of 15 wt. percent. This work studied the effects of coal feed rate, particle size and plasma temperature on yields and products formed. 

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