Theoretical And Experimental Investigation Of Nitrogen And Argon Nitrogen Radio Frequency Induction Coupled Plasma Discharge At Atmospheric Pressure
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Masters Theses in the Pure and Applied Sciences
| Author | : Wade H. Shafer |
| Publisher | : Springer Science & Business Media |
| Total Pages | : 307 |
| Release | : 2013-11-21 |
| Genre | : Science |
| ISBN | : 1475757794 |
Masters Theses in the Pure and Applied Sciences was first conceived, published, and dis· seminated by the Center for Information and Numerical Data Analysis and Synthesis (CINDAS) *at Purdue University in 1957, starting its coverage of theses with the academic year 1955. Beginning with Volume 13, the printing and dissemination phases of the ac· tivity were transferred to University Microfilms/Xerox of Ann Arbor, Michigan, with the thought that such an arrangement would be more beneficial to the academic and general scientific and technical community. After five years of this joint undertaking we had concluded that it was in the interest of all concerned if the printing and distribution of the volume were handled by an international publishing house to assure improved service and broader dissemination. Hence, starting with Volume 18, Masters Theses in the Pure and Applied Sciences has been disseminated on a worldwide basis by Plenum Publishing Corporation of New York, and in the same year the coverage was broadened to include Canadian universities. All back issues can also be ordered from Plenum. We have reported in Volume 20 (thesis year 1975) a total of 10,374 theses titles from 28 Canadian and 239 United States universities. We are sure that this broader base for theses titles reported will greatly enhance the value of this important annual reference work. The organization of Volume 20 is identical to that of past years. It consists of theses titles arranged by discipline and by university within each discipline.
Theoretical and Experimental Investigation of the Inductively Coupled Argon Plasma as a Spectrochemical Source
| Author | : Robert Gerard Schleicher |
| Publisher | : |
| Total Pages | : 674 |
| Release | : 1979 |
| Genre | : Argon |
| ISBN | : |
Research on Radiation from Arc Heated Plasma
| Author | : J. C. Morris |
| Publisher | : |
| Total Pages | : 98 |
| Release | : 1964 |
| Genre | : Electric arc |
| ISBN | : |
The spectral distribution of the continuum radiation of nitrogen and argon plasma was measured for temperatures ranging from 8000K to 13000K at atmospheric pressure. The wavelength interval, 2680 A to 20900 A, over which the nitrogen continuum was investigated accounts for approximately 90 percent of the total energy radiated by the continuum. The spectral distribution of the continuum is integrated to obtain a measurement of the total continuum energy radiated from nitrogen. These data are compared with direct measurements of the total radiation and with a number of theoretical predictions. These comparisons indicate that atomic line radiation is not an important contributor to the total radiation for the conditions under investigation and that another source of continuum radiation such as the negative nitrogen ion may be an important contributor in the visible region of the spectrum. Electrical and thermal conductivities of nitrogen and argon plasma were measured over the temperature range from 8000K to 13000K at atmospheric pressure. Comparison is made between theory and other experimental investigations. (Author).
Inductively Coupled Plasma--atomic Emission Spectroscopy
| Author | : |
| Publisher | : |
| Total Pages | : |
| Release | : 1979 |
| Genre | : |
| ISBN | : |
The effects of the use of nitrogen in either the plasma coolant or aerosol carrier gas flows on the physical and spectrochemical properties of the inductively coupled plasma (ICP) were examined. While the plasma operated with nitrogen in the coolant flow exhibited a stability comparable to that of the argon plasma, the use of nitrogen in the aerosol carrier gas flow resulted in a plasma that was less stable. The detection limits obtained for the three plasmas exhibited a similar trend. In addition, the use of nitrogen--argon admixtures in the plasma coolant gas flow yielded an increase in both the net analyte and the background emission intensities when the corresponding argon and nitrogen--argon plasmas were operated under various conditions. Furthermore, the effect of aluminum on the Ca II (393.4 nm) spectral line was reported for the 1000/1 Al/Ca molar ratio. At an observation height of 15 mm, the signal depressions were 4 and 14% for the nitrogen--argon and the argon plasmas, respectively. The above experimental evidence suggested that the operation of the ICP with an Ar--N2 coolant gas might be hotter than the argon plasma currently in use in this laboratory. The demountable plasma torch designed in collaboration with K. Olson yielded detection limits for 15 elements and 19 spectral lines that were approximately within a factor of two of those obtained with the torch of fused quartz design. The design also appeared to offer a more readily initiated plasma discharge. The experimental evidence presented supports the utilization of nitrogen--argon admixtures in the plasma coolant gas flow as alternate discharge atmospheres for inductively coupled plasma--atomic emission spectroscopy. In contrast, the experimental evidence shows that there is a deterioration in both physical and spectrochemical properties of plasmas operated with a nitrogen aerosol carrier gas.
Modelling and Diagnostics of Atmospheric Argon Radio Frequency Inductively Coupled Plasma [microform]
| Author | : Guangning Gao |
| Publisher | : Library and Archives Canada = Bibliothèque et Archives Canada |
| Total Pages | : 302 |
| Release | : 2004 |
| Genre | : |
| ISBN | : 9780612944299 |
This dissertation describes the work on the modelling and diagnostics of atmospheric argon radio frequency (RF) inductively coupled plasma (ICP).A fully computer-controlled optical emission spectroscopy (OES) experimental system was established during this project, and it was used to measure the plasma temperature and electron densities of a 40 MHz argon RF ICP. The excitation temperature measured from the Boltzmann plot, and electron density from the continuum emission are proved to be reliable estimations. The temperature measurement showed agreement with the prediction of the model, whereas the estimation of the electron density needed improvement. Emission asymmetry was found to exist within the coil zone of the RF plasma. The tomography technique was applied to obtain the two-dimensional local emission profile of a 40 MHz argon RF ICP. This technique provides the basis for further investigation of the effect of the emission asymmetry on the plasma field measurement, and development of the current model. We developed a new integrated model by applying the EEDF obtained using the Boltzmann equation solver ELENDIF. The two-temperature model and ELENDIF program were combined and numerically solved together. The Maxwellian EEDF assumption was then relaxed in the new model. The model was applied to calculate the plasma fields for argon RF ICP at frequencies 13.56 and 40 MHz. The results show that the Maxwellian EEDF is still a good assumption for a 40 MHz argon RF ICP, whereas it will cause errors for the predictions of the plasma fields of the 13.56 MHz plasma. The new model can treat more complicated cases of argon RF ICP. The assumption of the Maxwellian electron energy density function (EEDF) in the two-temperature model was examined by applying the Boltzmann equation solver ELEN-DIF program. The Maxwellian EEDFs of 13.56 and 40 MHz argon RF ICP, under non-equilibrium conditions, are proved to give inaccurate estimations of the high energy electron population and the energy transfer from the electrons to atoms/ions, which will consequently affect prediction of the plasma fields.
