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43
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84951347176
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Ph.D. Dissertation, University of California, San Diego
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(1978)
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Luo, H.H.1
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45
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0003952728
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(McGraw-Hill, New York) It may be noted that the exponential term often appears as [formula omitted] instead of [formula omitted] with an appropritae change from 2π to 4π in the pre-exponential factor in many standard texts. This only affects the definition of D̄, but not the solution of the diffusion equation
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(1953)
Methods of Theoretical Physics
, pp. 1584
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-
Morse, P.M.1
Feshbach, H.2
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48
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84951347183
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It may be noted that in the numerical example cited by Palmer in Ref. 26 for the [formula omitted] TEA laser breakdown condition, a relatively low value of [formula omitted] was obtained for the minimum preionization density using his Eq. (7). This was probably due to his choice of [formula omitted] for the electron mean free path, which implied an exceedingly small averaged momentum transfer cross section Q̄ of [formula omitted] for electron molecule collisions in the TEA laser gas mixture at 1 atm pressure.
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-
-
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49
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84951347180
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-
The presence of positive ions within the avalanche head will make the diffusion process somewhat ambipolar in character, and hence will slow down the outward diffusion rate of the free electrons. On the other hand, the presence of a net negative charge within the avalanche head will speed up the outward diffusion rate of the free electrons due to Coulomb repulsion. The two effects therefore tend to nullify each other to some extent.
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-
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52
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84951347208
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As discussed in Refs. 47 and 48, the existence of a distinct optimum delay time for maximum power output as observed in many of these fast discharge driven rare-gas-halide excimer lasers was probably related to the negative ion formation and other electrochemical effects associated with the preionization process. Diffusion times required for smoothing out any preionization inhomogeneities caused by the nonuniform nature of the uv preionization source might also have played a role. In any case, the optimum delay time was often comparable to or much longer than the width (FWHM) of the uv preionization pulse. Accordingly, the source strength at [formula omitted] can be considered as practically zero in most of the uv-preionized fast discharge experiments reported in the literature.
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-
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57
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84951347205
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Parametric Studies—Operational Data of a Cable Driven KrF Laser
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University of California Los Alamos Scientific Laboratory, Bidders— Conference on Design, Fabrication, and Delivery of a 1000-W, 1000-Hz KrF Laser System, 22 February
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(1978)
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-
Butcher, R.1
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