Tran Michaël K, Levallois Julien, Akrap Ana, Teyssier Jérémie, Kuzmenko Alexey B, Lévy-Bertrand Florence, Tediosi Riccardo, Brandt Mehdi, Lerch Philippe, van der Marel Dirk
Département de Physique de la Matière Quantique, Université de Genève, Quai Ernest-Ansermet 24, CH-1211 Genève 4, Switzerland.
Infrared Beamline, Swiss Light Source, Paul Scherrer Institute, CH-5232 Villigen-PSI, Switzerland.
Rev Sci Instrum. 2015 Oct;86(10):105102. doi: 10.1063/1.4931990.
We present an optical setup for spectroscopic measurements in the infrared and of Raman shift under high pressure and at low temperature. Using a membrane-driven diamond anvil cell, the pressure can be tuned in situ up to 20 GPa and the temperatures ranges from room temperature down to 18 K in transmission mode and 13 K in reflection mode. In transmission, the setup is entirely working under vacuum to reduce the water absorption features and obtain a higher spectral stability. Since the infrared throughput obtained with a thermal source is limited, the use of a synchrotron source allowed to enhance the performance, as illustrated with results obtained with various materials. The analysis of the reflectivity is adapted so that it benefits from ambient pressure data and produces quantitative optical conductivity curves that can be easily compared to the results at ambient pressure.
我们展示了一种用于在高压和低温下进行红外光谱测量以及拉曼位移测量的光学装置。使用膜驱动金刚石对顶砧池，压力可原位调节至20吉帕，温度范围在透射模式下从室温降至18开尔文，在反射模式下为13开尔文。在透射模式下，该装置完全在真空环境中工作，以减少水吸收特征并获得更高的光谱稳定性。由于利用热光源获得的红外通量有限，使用同步辐射源可提高性能，这在对各种材料获得的结果中得到了体现。对反射率的分析经过调整，使其受益于常压数据，并生成可轻松与常压下的结果进行比较的定量光导率曲线。
