Abstract
Abstract Radio Recombination Lines (RRLs) of carbon have been observed now in a wide range of wavelengths from mm to dam. They allow to investigate CII regions formed at the surface of molecular clouds exposed to external ionizing UV radiation. It is important to combine observations at high frequencies where the RRLs of carbon are observed in emission with those at low frequencies where they are observed in absorbtion. When analyzing carbon RRLs, it is useful to add observational data on the C + 158μm 2 P 3/2 – 2 P 1/2 fine-structure line. This line is emitted by the same carbon ions which form the RRLs under recombination on high levels. Results for concrete sources are discussed.
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