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Radio spectroscopists usually work at a single wavelength region. They must use
not only a very sensitive receiver as their spectroscope but also a large antenna
or radio telescope, which like other telescopes, selects a small area of the sky ...
The excited state may be one of increased rotation or vibration of the atoms
within the molecules, and the absorbed wavelengths are then in the infrared
spectral region. A change in electronic motion influences frequencies in and near
It is inconvenient when used to scan more than a small range of wavelengths; the
Fabry-Perot interferometer is most useful for detailed exploration of a single line
for profiles or Doppler shifts. High For the infrared above 10,000-angstroms ...
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This is the 198215th Edition, in two halves, with the Macropaedia and the Micropaedia. First published in 1768, the publisher is the oldest English-language encyclopedia still in print. Two Scottish ... Read full review