An approach for the measurement of the bulk temperature of single crystal diamond using an X-ray free electron laser
An approach for the measurement of the bulk temperature of single crystal diamond using an X-ray free electron laser
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DOI：
10.1038/s41598-020-71350-x
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发表时间：
2020-09-03
影响因子：
4.6
通讯作者：
McBride, E. E.
中科院分区：
文献类型：
--
作者：
Descamps, A.;Ofori-Okai, B. K.;McBride, E. E.
提出了一种在x射线自由电子激光下用非弹性x射线散射测定单晶金刚石样品体温的方法。实验是在德国欧洲XFEL公司的高能量密度仪器上进行的。该技术基于非弹性x射线散射和详细平衡原理，对室温钻石和加热到500 K的钻石都能给出精确的温度测量，误差在8%以内。在这里，使用电阻加热器以一种可控的方式增加温度，以测试信号随温度缩放的理论预测。利用非弹性x射线散射和中子散射技术，在室温下对声子模式的能量进行了验证。该技术可用于确定瞬态系统的体温，其时间分辨率为50秒，对热力学性质的精确测量对于建立精确的状态方程和输运模型至关重要。
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 8% 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.