Ar discharge

FIG. 44. Plasma parameters as deduced from the lEDs and material properties as a function of power delivered to the SiHa-Ar discharge at an excitation frequency of 50 MHz and a pressure of 0.4 mbar (a) the plasma potential Vp (circles) and dc self bias (triangles), (b) the sheath thickness d, (c) the maximum ion flux r ax. (d) the growth rate r,/. (e) the microstructure parameter R. and (f) the refractive index ni ev- (Compiled from E. A. G. Hamers. Ph.D. Thesis, Universiteit Utrecht, Utrecht, the Netherlands. 1998.)... 

The phosphorus sulfides PS, P2S, and PS2 have been made by allowing P4 and Sg vapors to react in an Ar discharge. Isotopic substitution studies show that P2S is linear like P2O and N2O, while PS2 is bent like PO2 and NO2. The species in the vapor above heated P4S10 have been the focus of some controversy. It has been claimed that P4S10 sublimes undissociated. However, matrix-isolation experiments reveal... 

If one applies the same principle for Ar discharge to the glow discharge of organic molecules, the first step of ionization could be written as... 

The rate of sputtering of aluminum from the electrode used in a magnetron plasma polymerization system is dependent on the plasma energy density, which can be stipulated by the external parameter Vjp, which is the acceleration potential in the vicinity of the cathode, for Ar discharge, while the deposition of CH4 is dependent on WjFM in joules per kilogram of CH4 for LCVD as described in Chapter 8. 

ELECTRON TEMPERATURE AND ELECTRON DENSITY 2.1. Ar Discharge Without Magnetron (C-A)... 

How effectively a DC discharge of argon could clean the cathode surface can be seen by observing the disappearance of color of the cathode, which is created by the deposition of TMS on a cold-rolled steel, by Ar discharge treatment [2]. The cathodic... 

Figure 32.21 summarizes results of Rp measurement of TMS plasma-coated Alclad 7075-T6 panels under IVD conditions in both closed and flow reactor systems, with and without subsequent Ar plasma treatments. TMS plasma coatings produced in a closed reactor system showed higher Rp values than those obtained in a flow reactor system. The second Ar discharge treatment of the flow system TMS coating remarkably increased the Rp value to nearly comparable to that for the closed system TMS. The second Ar plasma treatment of the closed system TMS coating, on the other hand, reduced the value of Rp slightly from that for the closed system TMS. 

H2/Ar discharge flow system. 222 OH from H + NO2. NO2 added at moveable inlet. 

A comparative study of spark-ablation ICP-MS and GD-MS in the case of steel has been reported by Jakubowski and coworkers [536, 613], The RSFs for a number of trace elements and the measurement precision are very similar in both cases. Steel analysis by GD-MS benefits from the addition of 1% of H2 to the Ar discharge gas [614], the explanation for which is certainly complex. For certified reference steels, including superalloys, reliable analysis results can be obtained. The determination of Mo, Nb and Zr in steels by GD-MS was found to be affected by the formation of multiply-charged cluster ions (metal argides) [615]. A correction based on the assumption that the rate of formation of the singly-charged argide is the same for all analytes and coincident with that of FeAr+ was used. The capabilities of low resolution GD-MS were shown by the example of steel analysis [616], where detection limits were down to 1 ng/g and up to 30 elements could be determined. 

The next state in the singlet ladder is the b state. NH in this state can be obtained in the NH3 VUV photolysis [54 to 57] and ND(b) from ND3 VUV photolysis, respectively [56]. The vacuum ultraviolet radiation is produced in Ar discharge separated from the photolysis volume by an LiF window. The formation of NH(b was also observed in the ArF laser photolysis of HN3 [58]. The NH(b formation was observed in a discharge flow reactor in the reaction of H atoms with N3 radicals [59]. 

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