Abstract
The radio observation of interstellar molecules has grown into an important, exciting, and challenging field since the OH radical (emitting in its ʌ-doublet state at λ ∿ 18 cm) was detected in 1963. Searches for OH, CH, and SiH had been proposed by Shklovsky (USSR), in 1948, and by Townes (at the Washington Conference on Radio Astronomy) in 1954. Unsuccessful OH searches were performed by Barret and Lilley in 1956. With a good telescope, the Millstone 25.6 m instrument, more advanced technology (including Weinreb’s autocorrelator), and with more accurate main-line frequency data (obtained by Townes and associates at Columbia) the detection of OH finally became possible.
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References
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Rydbeck, O.E.H., Hjalmarson, Å. (1985). Radio Observations of Interstellar Molecules, of their behaviour, and of their physics. In: Diercksen, G.H.F., Huebner, W.F., Langhoff, P.W. (eds) Molecular Astrophysics. NATO ASI Series, vol 157. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-5432-8_3
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