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This hygrometer is designed to measure the humidity of atmospheric air over the vapor pressure range 3–7400 Pa (0.03–74 mbar). The instrument is an adaptation of a microwave refractometer using two cavities operating at 12 GHz. One cavity is exposed to the moist test air and the other is...
Several solid source loading materials for the production of a boron ion beam with a hot filament hollow cathode ion source are compared. As far as easy handling and large B + currents are concerned, oxidized boron nitride is shown to be an excellent choice. Currents of 80 μA 11 B + are...
A system is described which can measure plasma electric fields on nanosecond time and submillimeter distance scales. The measurement is made by observing the time dependent deflection of a 10 −7 A beam of 22 keV He + ions. The measurement does not perturb the plasma.
A simple instrument to make absolute velocity calibrations of velocity transducers used in Mössbauer effect measurements is described. A short comparison with other calibration techniques is made.
A parallel‐plate Stark cell giving a very homogeneous electric field is described. It can be used either for Stark spectroscopy in the infrared and microwave ranges or in infrared–microwave double resonance experiments. Microwave absorption lines, 12.600 GHz frequency shifted, have been...
A differential refraction spectrometer for measuring the absolute intensity distribution of microwave spectra in gases by means of dispersion pressure profiles is described. The instrument was applied to study the 60 GHz band spectrum of oxygen under simulated atmospheric conditions (10 −3...
An optical superheterodyne analyzer, which is destined for high resolution spectral analysis in the optical domain, is described. The optical local oscillator of continuously variable frequency, the core of this analyzer, is obtained by means of an acousto‐optic effect. By changing the acoustic...
A rocking furnace is described that permits variable agitation of melts prior to crystal growth. The design permits adjustment of furnace inclination, variation of oscillation frequency and amplitude, and rotation of the furnace into a vertical position. The fabrication of an explosion‐proof...
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