Iron dynamics in earth mantle minerals probed by Mössbauer spectroscopy using synchrotron radiation

探讨地幔中含铁矿物的动力学性质，可以从微观尺度上认识地震资料。穆斯堡尔谱学是研究含铁矿物的电子和动力学性质的首选方法。因此，我们建议在高压下用同步辐射穆斯堡尔谱测量含铁矿物橄榄石、辉石、铁硅酸盐钙钛矿和铁方镁石的动力学性质。核非弹性散射（NIS）和伴随的量子力学模型计算采用密度泛函理论（DFT）将提供实验和理论研究中的矿物的声子态密度。用这种方法，我们将获得在高压条件下这些材料中的声速信息。与NIS实验平行，我们将进行核前向散射（NFS），这将产生铁的价态和相应的铁矿物相的信息。这是特别有趣的，在该地区的相变是负责地震响应的地幔的不连续性。

Exploring the dynamic properties of iron minerals contained in the earth mantle enables to understand seismologic data on the microscopic scale. Mössbauer spectroscopy is the method of choice if electronic and dynamic properties of iron containing minerals have to be investigated. We therefore propose to measure the dynamic properties of the iron containing minerals olivine, pyroxene, iron silicate perovskite and ferropericlase by Mössbauer spectroscopy under high-pressure with synchrotron radiation. Nuclear inelastic scattering (NIS) and accompanying quantum mechanical model calculations employing density functional theory (DFT) will deliver the phonon density of states of the minerals under investigation both experimentally and theoretically. In this way we will obtain information on the velocity of sound in these materials under high pressure conditions. Parallel to the NIS experiments we will perform nuclear forward scattering (NFS) which will yield information on the iron valence state and the corresponding iron mineral phases. This is especially interesting in the region of phase transitions which are responsible for discontinuities in the seismic response of the earth mantle.