Vibrations Under Pressure

摘要

Pressure is one of the key, variables in Earth science, ranging from an extremely small fraction of 1 atm in the upper atmosphere (~1 Paop~10~(-5) atm) to probably more than 3.5 x 10~(11) Pa at Earth's center. However, unlike temperature, pressure hasrarely played a role in the interpretations of the variations in the stable isotope ratios of elements such as hydrogen (D/H) and oxygen (~(18)O/~(16)O) that are observed in natural solids and fluids. Dreisner (1), on page 791 of this issue, and a number of recent studies (2-4) suggest that the pressure dependence of some isotope equilibrium fractionation factors may not be negligible. The results are important from both a theoretical and experimental point of view and for the applied geochemistry community.