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- W3197067354 endingPage "031501" @default.
- W3197067354 startingPage "031501" @default.
- W3197067354 abstract "Laser-based primary thermometry was initiated almost 15 years ago by the proposal to determine the absolute temperature of a gas at thermodynamic equilibrium through the Doppler width of an associated absorption transition, exploiting the potentially very accurate measurement of an optical frequency to infer the elusive thermal energy of a molecular or atomic absorber. This approach, commonly referred to as Doppler broadening thermometry, has benefited across the years from substantial improvements, of both technical and fundamental nature, eventually reaching an accuracy of about 10 ppm on the temperature determination in the best cases. This is sufficient for Doppler broadening thermometry to play a significant role in the practical realization of the new kelvin, which follows the 2019’s redefinition from a fixed value of the Boltzmann constant, and to tackle the challenge, among others, to quantify and possibly fix systematic uncertainties of the international temperature scale of 1990. This paper reviews and comparatively analyzes methods and results achieved so far in the field of laser-based primary thermometry, also including spectroscopic approaches that leverage the temperature-dependent distribution of line intensities and related absorbances across the rovibrational band of a molecular sample. Although at an early stage of development, these approaches show a promising degree of robustness with respect to the choice of the line-shape model adopted for the fitting of the absorption spectra, which is a delicate aspect for all laser-based thermometers. We conclude by identifying possible technical and scientific evolution axes of the current scenario." @default.
- W3197067354 created "2021-09-13" @default.
- W3197067354 creator A5010672221 @default.
- W3197067354 creator A5028309677 @default.
- W3197067354 creator A5028605034 @default.
- W3197067354 creator A5051254205 @default.
- W3197067354 date "2021-09-01" @default.
- W3197067354 modified "2023-10-17" @default.
- W3197067354 title "Laser-Based Primary Thermometry: A Review" @default.
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