Experimental study of planetary ices at high pressure using dynamically-driven diamond-anvil cells
使用动态驱动金刚石砧室对高压行星冰进行实验研究
基本信息
- 批准号:329658874
- 负责人:
- 金额:--
- 依托单位:
- 依托单位国家:德国
- 项目类别:Research Units
- 财政年份:2017
- 资助国家:德国
- 起止时间:2016-12-31 至 2020-12-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
Planetary ice compounds (e.g. H2O, CH4, NH3) constitute large parts of solar giant ice planets and are likely abundant in the interiors of recently discovered exoplanets. The physical properties and phase diagrams of these compounds at the pressure and temperature conditions of planetary interiors are poorly understood. Previous experimental studies using x-ray diffraction in static diamond-anvil cells were limited to comparably low pressures as a result of experimental dfficulties related to the small scattering effciency of these low-Z compounds and weakening of the high-pressure cell resulting from reactions with the sample materials. In the proposed research, we will employ recently developed dynamically-driven diamond-anvil cells (dDAC and mDAC) to compress planetary ice compounds on short time scales (milliseconds to seconds). The rapid compression will prevent chemical reactions and will allow for reaching pressures that were previously not accessibly by experiments. During compression, we will probe the samples by x-ray diffraction to study their structure, phase stability and equations of state. Such fast diffraction experiments have only recently become possible with the development of new superfast detectors. Initial experiments will be performed at the Extreme Conditions Beamline at PETRA III, DESY. During the course of the project, we will start performing experiments at the High Energy Density instrument at the European XFEL that will become available to users in 2018. The results of our experiments will provide new insights to the stability felds and physical properties of planetary ice compounds in the interiors of solar giant ice planets and exoplanets. The results will also provide key anchor points to constrain computational predictions (carried out in SP3) and serve as input parameters for large-scale numerical models to simulate the dynamics of planets (collaboration with SP4/SP5).
行星冰化合物(如H2O,CH 4,NH3)构成了太阳系巨冰行星的大部分,并且可能在最近发现的系外行星的内部丰富。这些化合物在行星内部的压力和温度条件下的物理性质和相图知之甚少。以前在静态金刚石压砧单元中使用X射线衍射的实验研究仅限于超低压,这是由于与这些低Z化合物的小散射效率和与样品材料反应导致的高压单元的弱化有关的实验困难。在拟议的研究中,我们将采用最近开发的动态驱动金刚石砧单元(dDAC和mDAC)在短时间尺度(毫秒到秒)上压缩行星冰化合物。快速压缩将防止化学反应,并将允许达到以前无法通过实验获得的压力。在压缩过程中,我们将通过X射线衍射来探测样品,以研究它们的结构、相稳定性和状态方程。这种快速衍射实验直到最近才随着新的超快探测器的发展而成为可能。最初的实验将在PETRA III,DESY的极端条件光束线上进行。在该项目的过程中,我们将开始在欧洲XFEL的高能量密度仪器上进行实验,该仪器将于2018年提供给用户。我们的实验结果将为太阳系巨冰行星和系外行星内部行星冰化合物的稳定性和物理性质提供新的见解。研究结果还将提供关键的锚点,以约束计算预测(在SP3中进行),并作为模拟行星动力学的大规模数值模型的输入参数(与SP 4/SP 5合作)。
项目成果
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Hanns-Peter Liermann, Ph.D., since 9/2018其他文献
Hanns-Peter Liermann, Ph.D., since 9/2018的其他文献
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