Focused Ion Beam Capabilities at the Sandia Ion Beam Laboratory.
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An 'absorbing-sphere' model based on the Landau-Zener method is set up for calculating the upper limit thermal energy (300 K) reaction rate and the energy dependence of the total cross sections. The crucial parameter needed for the calculation is the electron detachment energy for the outer electron on the anion. It is found that the cross sections increase with decreasing electron detachment energy.
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Migration of aqueous solutions through electrode pellet, and thus corrosion of soldered connection, is prevented by coating pellet and silver wire attachment with silver-conductive epoxy.
The self-excitation of the slow beam mode has been studied in an experiment performed with a double-plasma device having multidipole confinement. The oscillations observed are nearly monochromatic. The feedback mechanism which produces the frequency selection is probably provided by the backward acoustic mode, rather than the instantaneous mechanism proposed by Fujita el al. (1977).