title: Fast temperature spectrometer for samples under extreme conditions.
abstract: We have developed a multi-wavelength Fast Temperature Readout (FasTeR) spectrometer to capture a sample's transient temperature fluctuations, and reduce uncertainties in melting temperature determination. Without sacrificing accuracy, FasTeR features a fast readout rate (about 100 Hz), high sensitivity, large dynamic range, and a well-constrained focus. Complimenting a charge-coupled device spectrometer, FasTeR consists of an array of photomultiplier tubes and optical dichroic filters. The temperatures determined by FasTeR outside of the vicinity of melting are, generally, in good agreement with results from the charge-coupled device spectrometer. Near melting, FasTeR is capable of capturing transient temperature fluctuations, at least on the order of 300 K/s. A software tool, SIMFaster, is described and has been developed to simulate FasTeR and assess design configurations. FasTeR is especially suitable for temperature determinations that utilize ultra-fast techniques under extreme conditions. Working in parallel with the laser-heated diamond-anvil cell, synchrotron Mössbauer spectroscopy, and X-ray diffraction, we have applied the FasTeR spectrometer to measure the melting temperature of (57)Fe0.9Ni0.1 at high pressure.
authors: Seismological Laboratory, California Institute of Technology, Pasadena, California 91125, USA.
authors: Dongzhou
authors: D
authors: Zhang
authors: Seismological Laboratory, California Institute of Technology, Pasadena, California 91125, USA.
authors: Jennifer M
authors: JM
authors: Jackson
authors: Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA.
authors: Jiyong
authors: J
authors: Zhao
authors: Seismological Laboratory, California Institute of Technology, Pasadena, California 91125, USA.
authors: Wolfgang
authors: W
authors: Sturhahn
authors: Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA.
authors: E Ercan
authors: EE
authors: Alp
authors: Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA.
authors: Thomas S
authors: TS
authors: Toellner
authors: Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA.
authors: Michael Y
authors: MY
authors: Hu