Isotopic abundances indicate processes over the history of the Solar System.
2.
There is a known variation in the isotopic abundance of chlorine-37.
3.
It also led to explanations for the isotopic abundances of present-day planetary atmospheres.
4.
Isotopic abundances are different in morphine grown from poppies in South-east Asia versus poppies grown in South-West Asia.
5.
This full proton decoupling eliminates all coupling with H atoms and thus splitting due to H atoms in natural isotopic abundance compounds.
6.
Thus, the element's natural isotopic abundance is dominated either by one stable isotope or by one very long-lived isotope.
7.
Isotopic abundance of carbon, hydrogen, nitrogen, and oxygen isotopic abundance become locally enriched or depleted through a variety of atmospheric processes.
8.
Isotopic abundance of carbon, hydrogen, nitrogen, and oxygen isotopic abundance become locally enriched or depleted through a variety of atmospheric processes.
9.
Similarly for all practical purposes, 13 C signal splitting due to coupling with nearby natural isotopic abundance carbons is negligible in 13 C NMR spectra.
10.
These implementations paved the way to the spectral characterization of solid samples at natural isotopic abundance, in a manner similar to liquid-state NMR.
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