Plasma display construction

Dissociative excitation of molecules by electrons is a key process in many industrially important plasmas because it is the mechanism that provides the activated radicals that initiate the surface chemistries of interest. For example, many of the gases used in the etching of silicon do not display any reactivity in the absence of plasma. The construction of detailed models of these plasmas relies on a reliable data base of cross sections. Unfortunately, electron-impact dissociation cross sections are extremely difficult to measure and there are only a handful of cases where good data exist. Chlorine gas, which is widely used in the plasma etching of semiconductors, is one such example. Cross sections for ionization and dissociative electron attachment were measured during the 1970s and there has been one experimental study of electron impact dissociation. Cross sections for other dominant electron collision processes have been derived from Boltzmann analysis and early swarm measurements. ... 

The box plot has proved to be a popular graphical method for displaying and summarizing univariate data, to compare parallel batches of data, and to supplement more complex displays with univariate information. Its appeal is due to the simplicity of the graphical construction (based on quartiles) and the many features that it displays (location, spread, skewness, and potential outliers). Box plots are useful for summarizing distributions of treatment outcomes. A good example would be the comparison of the distribution of response to treatment at different dose levels or exposure (as measured by area under the plasma concentration-time curve) as in Figure 37.3. 

The prevalent technology of large screen luminescent panels employs plasma excitation of phosphors overlying each display cell. The plasma is formed in low-pressure gas that may be excited by either AC or DC fields. Figure 7.40 depicts a color DC plasma panel. Such devices have been constructed in a variety of sizes and cell structures. Color rendition requires red/green/ blue trios that are excited preferentially or proportionally, as in a color CRT, which triples the number of actual cells (three cells comprise one picture element). 

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