Abstract
We present a portable CO2 laser heating system for in situ x-ray absorption spectroscopy (XAS) studies at 16-BM-D (High Pressure Collaborative Access Team, Advanced Photon Source, Argonne National Laboratory). Back scattering optical measurements are made possible by the implementation of a Ge beamsplitter. Optical pyrometry is conducted in the near-infrared, and our temperature measurements are free of chromatic aberration due to the implementation of the peak-scaling method [A. Kavner and W. R. Panero, Phys. Earth Planet. Inter. 143-144, 527-539 (2004) and A. Kavner and C. Nugent, Rev. Sci. Instrum. 79, 024902 (2008)] and mode scrambling of the input signal. Laser power stabilization is established using electronic feedback, providing a steady power over second timescales [Childs et al., Rev. Sci. Instrum. 91, 103003 (2020)] - crucial for longer XAS collections. Examples of in situ high pressure-temperature extended x-ray absorption fine structure measurements of ZrO2 are presented to demonstrate this new capability.
| Original language | English |
|---|---|
| Article number | 083901 |
| Journal | Review of Scientific Instruments |
| Volume | 93 |
| Issue number | 8 |
| DOIs | |
| State | Published - Aug 1 2022 |
Funding
This work was supported, in part, by the National Nuclear Security Administration under the Stewardship Science Academic Alliances program through DOE Cooperative Agreement No. DE-NA0001982. Portions of this work were performed at HPCAT (Sector 16), Advanced Photon Source (APS), Argonne National Laboratory. HPCAT operations are supported by DOE-NNSA’s Office of Experimental Sciences. The Advanced Photon Source is a U.S. Department of Energy (DOE), Office of Science User Facility, operated for the DOE Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357. Portions of this work were performed under the auspices of Los Alamos National Laboratory. LANL is operated by Triad National Security, LLC, for the DOE-NNSA under Contract No. 89233218CNA000001. J.S.P. acknowledges support from the Harold Agnew National Security Postdoctoral Fellowship, with funding provided by LANL’s Office of Experimental Sciences. This work was supported by Mission Support and Test Services LLC, under Contract No. DE-NA0003624 with the U.S. Department of Energy. Part of this work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract Nos. DE-AC52-07NA27344 and LLNL-JRNL-830581-DRAFT.