Titlebook: CNO Isotopes in Astrophysics; Proceedings of a Spe Jean Audouze Conference proceedings 1977 D. Reidel Publishing Company, Dordrecht,Holland

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Isotope Fractionation in Interstellar Moleculesal electron density and CO abundance — can be derived from the fractionation process producing the enhanced DCO./HCO. ratio. Possible fractionation reactions for isotopes of other elements (oxygen, sulfur) are mentioned briefly.

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https://doi.org/10.1007/978-3-662-52815-0Mahoney, McCutcheon and Shuter (1976) reported observations of the J = 1 → 0 transition of three isotopes of CO in the dust cloud Lynds 134 using the 4.6 m telescope at Aerospace Corporation. Here we discuss a new observation of .C.O and consider further the question of the ratio .C.O/.C.O across the dust cloud.

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https://doi.org/10.1007/978-3-662-68674-4To derive abundance ratios from measured line intensities several fundamental assumptions are usually made. The two most important of these are that:

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