Nature

Observation of a Line in the Galactic Radio Spectrum: Radiation from Galactic Hydrogen at 1,420 Mc./sec.

We can now report success in observing this line. A micro-wave radiometer, built especially for the purpose, consists mainly of a double superheterodyne receiver with pass band of 17 kc., the band ...
Ars Technica

QM: How to calculate the energy of the hydrogen line

I'm writing up a report about 21cm-line radio astronomy, and it includes a discussion of spectral lines and the 21cm line in particular.<BR><BR>However, I have a problem that I was hoping the genius ...
Nature

Observation of a Line in the Galactic Radio Spectrum: The Interstellar Hydrogen Line at 1,420 Mc./sec., and an Estimate of Galactic Rotation

PAWSEY, J. Observation of a Line in the Galactic Radio Spectrum: The Interstellar Hydrogen Line at 1,420 Mc./sec., and an Estimate of Galactic Rotation. Nature 168 ...