Abstract
Is it hot in here? The recent redefinition of the kelvin unit of temperature, in terms of a fixed value of Boltzmann's constant, prompts interest in primary-standard gas thermometers that could quantify possible differences from the International Temperature Scale (ITS-90). This study reports significant progress in the development of low-uncertainty Doppler-broadening thermometry. Successful operation of a comb-calibrated near-infrared absorption spectrometer is demonstrated by probing a line doublet of acetylene. This enables the authors to make thermodynamic temperature measurements with a statistical uncertainty of less than 10 parts per million.
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