玻尔兹曼常数在10-5能级的光学测量

Annales De Physique Pub Date : 2007-01-01 DOI:10.1051/ANPHYS:2008036

K. Djerroud, C. Daussy, O. Lopez, A. Amy-Klein, S. Briaudeau, Y. Hermier, C. Chardonnet

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引用次数: 8

摘要

提出了一种用激光光谱法直接测定玻尔兹曼常数的新方法。该原理包括在273.15 K左右的受控温度下记录原子或分子线在蒸气中的线性吸收。通过消除压力展宽，我们推导出了纯多普勒宽度，从而给出了玻尔兹曼常数k B的首次光学测量。目前的测定应在不久的将来得到显著改进，并有助于开尔文的新定义。

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Towards an optical measurement of the Boltzmann constant at the 10-5 level

We present a new method for direct determination of the Boltzmann constant by laser spectroscopy. The principle consists in recording the linear absorption in a vapour of an atomic or molecular line at a controlled temperature around 273.15 K. By eliminating the pressure broadening, we deduced the pure Doppler width which gives a first optical measurement of the Boltzmann constant k B . The present determination should be significantly improved in the near future and contribute to a new definition of kelvin.

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Annales De Physique 物理-物理：综合

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