Probability integral isotope effect

Probability integral isotope effect due to different reaction probability per collision and different range of reaction... 

Of these isotope effects, (1) moderator isotope effect and (3) average reaction energy isotope effect can be eliminated when experiments are performed at a high concentration of rare gas moderator. Therefore, use of a large amount of rare gas moderator (e.g., 90% Ar) is recommended to observe (2) the probability integral isotope effect, which is the most interesting one for hot atom chemists. 

The robustness of the Lu-Hf isotope system in some mantle environments is demonstrated by the precise Lu-Hf isochron of 1,413 67 Myr dehned by clinopyroxene separates from the Beni Bousera peridotite massif (Pearson and Nowell, 2003). This age probably dates the time of melt extraction from these rocks and is considerably more precise than the Sm-Nd isochron or the scattered Re-Os isotope systematics of these rocks. This indicates the potential power of this system in dating mantle rocks. The initial results from the Lu-Hf isotope system indicate that of the incompatible element isotope systems, it is the more robust to metasomatic effects, with signatures frequently recording the time-integrated response to melt depletion. 

---