Condensation and Evaporation of Solar System Materials

摘要: The volatile element depletion patterns of planetary size objects and the chemical isotopic composition numerous smaller such as chondrules calcium- aluminum-rich inclusions (CAIs) provide motivation to consider evaporation condensation processes in early solar system. Equilibrium thermodynamic calculations phases nebula an important reference with which natural system materials can be compared. theoretical background for fractionation elemental compositions during kinetically controlled is explored some detail. Some parameters calculated from first principles, but others must measured laboratory, a number experiments are described interpreted. Elemental fractionations then intepreted context experimental considerations. A key point that led planets appear have occurred under conditions very close equilibrium, whereas CAIs involved significant departures equilibrium.