The Investigation of Isotopic Mass Fractionation Processes in the Primordial Solar Nebula and the Realization of in-situ Isotope Survey of Primitive Materials

摘要

The problems in investigating the thermal history of the primordial solar nebula from the isotopic mass fractionation data are discussed based on the compiled data of primitive materials as well as on the results of reproducing experiments. The results of the experiments showed that isotopic mass fractionation is dominated by various conditions which may vary considerably in the nebula. The fractionation process is controlled for example by the state of the evaporation source, the rate of evaporation and the rate of source mixing as well as the molecular species of the gas phase.