Descamps A, Ofori-Okai B K, Appel K, Cerantola V, Comley A, Eggert J H, Fletcher L B, Gericke D O, Göde S, Humphries O, Karnbach O, Lazicki A, Loetzsch R, McGonegle D, Palmer C A J, Plueckthun C, Preston T R, Redmer R, Senesky D G, Strohm C, Uschmann I, White T G, Wollenweber L, Monaco G, Wark J S, Hastings J B, Zastrau U, Gregori G, Glenzer S H, McBride E E
SLAC National Accelerator Laboratory, Menlo Park, CA, 94025, USA.
Aeronautics and Astronautics Department, Stanford University, Stanford, CA, 94305, USA.
Sci Rep. 2020 Sep 3;10(1):14564. doi: 10.1038/s41598-020-71350-x.
We present a method to determine the bulk temperature of a single crystal diamond sample at an X-Ray free electron laser using inelastic X-ray scattering. The experiment was performed at the high energy density instrument at the European XFEL GmbH, Germany. The technique, based on inelastic X-ray scattering and the principle of detailed balance, was demonstrated to give accurate temperature measurements, within [Formula: see text] for both room temperature diamond and heated diamond to 500 K. Here, the temperature was increased in a controlled way using a resistive heater to test theoretical predictions of the scaling of the signal with temperature. The method was tested by validating the energy of the phonon modes with previous measurements made at room temperature using inelastic X-ray scattering and neutron scattering techniques. This technique could be used to determine the bulk temperature in transient systems with a temporal resolution of 50 fs and for which accurate measurements of thermodynamic properties are vital to build accurate equation of state and transport models.
我们提出了一种利用非弹性X射线散射来测定X射线自由电子激光下单晶金刚石样品体温度的方法。该实验在德国欧洲X射线自由电子激光有限公司的高能量密度仪器上进行。基于非弹性X射线散射和细致平衡原理的这项技术，已被证明能给出精确的温度测量结果，对于室温金刚石以及加热到500K的金刚石，测量误差在[公式：见原文]以内。在此，使用电阻加热器以可控方式升高温度，以测试信号随温度变化比例的理论预测。通过用先前在室温下使用非弹性X射线散射和中子散射技术所做的测量来验证声子模式的能量，对该方法进行了测试。这项技术可用于确定瞬态系统中的体温度，其时间分辨率为50飞秒，对于这类系统，准确测量热力学性质对于建立精确的状态方程和输运模型至关重要。
