Radio Recombination Lines: 25 Years of Investigation: Proceeding of the 125th Colloquium of the International Astronomical Union, Held in Puschino, U.S.S.R., September 11-16, 1989

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Radio Recombination Lines (RRLs), discovered in the USSR in 1964, have become a powerful research tool for astronomers. Available throughout the radio spectrum, these lines carry information regarding the density, temperature, turbulence and velocity of thermal plasmas. Their very existance shows the presence of thermal gas. They also can carry information regarding magnetic fields if Zeeman splitting were to be detected.
Containing the proceedings of an IAU Colloquium celebrati...