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WikiProject Elements / Isotopes  (Rated C-class, Low-importance)
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  • shoulndt exhibit the molecule with two C13 isotopes exhibit a mass spectrometric difference of m+2, compared to the molecule with only C12 (M)?

Yep, that's true. Such peaks are observed too. See Figure 1.A in The M+2 and even more peaks are observed, too.

  • What's the mass of a C13? It's not exactly m(C12)+1, or is it?


IT WAS COMMENTED OUT UNTIL AN EXPLANATORY CAPTION (clarifying the meaning and relationship of each one of the entries) IS WRITTEN FOR THIS BOX:

Carbon-13 is an
[[Isotopes of Carbon|isotope]] of [[Carbon]]
Decay product of:
Decay chain
of carbon-13
Decays to:

Article too narrowly focused[edit]

I came to this article after reading the following article about how scientists are using carbon-13 to deduce the origins of life of Earth:

I wanted to understand how biochemical reactions can distinguish between carbon-13 and other isotopes. But the current material here reads less like an encyclopedia article than an excerpt from a nuclear physics text. Can someone with more domain knowledge than I (on the whole subject of carbon-13, not just how to detect it) broaden this article to incorporate aspects of more general interest, like those that might answer my question? Thank you for any assistance. ~ Jeff Q (talk) 17:37, 28 November 2006 (UTC)

See Isotope fractionation Jclerman 18:57, 28 November 2006 (UTC)
Jeff Q is right, chemical and biochemical reactions should NEVER distinguish isotopes. But in fact enzymes distinguish them. I added this information and moved most of biological part of this article to Isotopic_signature#Carbon_isotopes in order to avoid duplication of material. Ivan Kucherenko (talk) 20:33, 11 April 2016 (UTC)