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Absolute temperature measurement in a laser‐heated diamond anvil cell
Author(s) -
Lin JungFu,
Sturhahn Wolfgang,
Zhao Jiyong,
Shen Guoyin,
Mao Hokwang,
Hemley Russell J.
Publication year - 2004
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2004gl020599
Subject(s) - laser , spectral line , diamond anvil cell , diamond , materials science , radiation , scattering , optics , atomic physics , analytical chemistry (journal) , physics , chemistry , diffraction , chromatography , astronomy , composite material
The laser‐heated diamond anvil cell has been widely used to study mineral physics under high pressure and temperature, and these studies have provided valuable information in understanding planetary interiors; however, use of the spectroradiometric method in the studies has raised concerns about the accuracy of obtained temperature values. We have built a laser‐heating system coupled with nuclear resonant inelastic x‐ray scattering to explore particular physical properties of deep‐Earth materials. Energy spectra of iron were measured up to 58 GPa and 1700 K. The detailed balance principle applied to the inelastic x‐ray scattering spectra provides absolute temperatures of the laser‐heated sample. These temperatures are in very good agreement with values determined from the thermal radiation spectra fitted to the Planck radiation function up to 1700 K. Our data provide, for the first time, independent confirmation of the validity of temperatures determined from spectroradiometric method in the laser‐heated diamond cell experiments.