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Time differentiated nuclear resonance spectroscopy coupled with pulsed laser heating in diamond anvil cells

机译:时差核磁共振波谱结合金刚石砧座单元中的脉冲激光加热

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摘要

Developments in pulsed laser heating applied to nuclear resonance techniques are presented together with their applications to studies of geophysically relevant materials. Continuous laser heating in diamond anvil cells is a widely used method to generate extreme temperatures at static high pressure conditions in order to study the structure and properties of materials found in deep planetary interiors. The pulsed laser heating technique has advantages over continuous heating, including prevention of the spreading of heated sample and/or the pressure medium and, thus, a better stability of the heating process. Time differentiated data acquisition coupled with pulsed laser heating in diamond anvil cells was successfully tested at the Nuclear Resonance beamline (ID18) of the European Synchrotron Radiation Facility. We show examples applying the method to investigation of an assemblage containing ε-Fe, FeO, and Fe$_3$C using synchrotron Mössbauer source spectroscopy, FeCO$_3$ using nuclear inelastic scattering, and Fe$_2$O$_3$ using nuclear forward scattering. These examples demonstrate the applicability of pulsed laser heating in diamond anvil cells to spectroscopic techniques with long data acquisition times, because it enables stable pulsed heating with data collection at specific time intervals that are synchronized with laser pulses.
机译:介绍了应用于核共振技术的脉冲激光加热技术的发展及其在地球物理相关材料研究中的应用。为了研究在深行星内部发现的材料的结构和特性,金刚石砧座电池中的连续激光加热是在静态高压条件下产生极端温度的一种广泛使用的方法。脉冲激光加热技术具有优于连续加热的优点,包括防止加热的样品和/或压力介质散布,从而提高加热过程的稳定性。在欧洲同步辐射装置的核共振光束线(ID18)上成功测试了金刚石砧座单元中时差数据采集以及脉冲激光加热。我们展示了使用该方法研究包含ε-Fe,FeO和Fe $ _3 $ C的组合物的示例,其中使用了同步加速器Mössbauer源光谱,FeCO $ _3 $使用核非弹性散射,Fe $ _2 $ O $ _3 $前向散射。这些示例说明了在金刚石砧座单元中进行脉冲激光加热对具有长数据采集时间的光谱技术的适用性,因为它可以在与激光脉冲同步的特定时间间隔进行数据收集,从而实现稳定的脉冲加热。

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