Abstract
An apparatus is described which has produced and detected narrow Hβ and Hγ spectral lines in an electron-bombarded atomic hydrogen beam. Hydrogen atoms produced in an electrodeless 50-Mc/sec discharge in wet hydrogen, diffused through a slit in the discharge tube wall to form a beam in a vacuum chamber. An electron gun bombarded the atomic beam along an axis perpendicular to the beam and optical axes; light produced in the decay of atoms excited by the bombardment was analyzed by a pressure-scanned Fabry–Perot interferometer and detected by a cooled photomultiplier. The output pulses from the photomultiplier were amplified and then stored as counts in a 400-channel analyzer. Linewidths characteristic of a source at about 33°K were obtained; however, the signals were so small and the line shapes sufficiently uncertain that no precise wavelength measurements could be made.
© 1964 Optical Society of America
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