Absolute differential cross sections (DCS s) for electron-impact excitation of the lowest forty electronic levels in atomic neon have been determined for incident electron energies of 30 and 50 eV, for the four lowest levels at 25 eV, and two levels at 100 eV. The cross sections for these forty electronic levels are grouped into fifteen features, six of which represent excitation to resolved single electronic levels and the remaining nine which contain the unresolved contributions from two or more electronic levels. These DCS's were extrapolated to 0' and 180' and integrated to yield absolute integral cross sections as a function of incident electron energy. The results are compared to other experimental and theoretical results.
This paper describes a microwave oscillator which is phase stabilized to a high-order microwave harmonic from a stable frequency standard, and which may be conveniently tuned through any selected 200-Mc band in the microwave frequency range. One form of this oscillator has a stability of a few parts in 10 8 throughout the 200-Mc tuning range, while a slightly more complex form has a stability of a few parts in 10· through a reduced tuning range. While this o~cillator has only been applied to a high resolution microwave spectrometer and to the spectrum analysis of stable cw microwave signals, it is also well adapted to gas beam maser spectroscopy.
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