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. Author manuscript; available in PMC: 2013 Feb 1.
Published in final edited form as: J Am Chem Soc. 2012 Jan 18;134(4):1914–1917. doi: 10.1021/ja208779k

Figure 3.

Figure 3

A cartoon depicting the effect of a heavy isotope on trajectories. Fewer trajectories recross at left because the ring closure, involving mainly light-atom motion, is slowed less than the recrossing is by the presence of a heavy isotope.