中国物理B ›› 2015, Vol. 24 ›› Issue (5): 53301-053301.doi: 10.1088/1674-1056/24/5/053301

所属专题: TOPICAL REVIEW — Precision measurement and cold matters

• TOPICAL REVIEW—Precision measurement and cold matters • 上一篇    下一篇

Optical determination of the Boltzmann constant

程存峰, 孙羽, 胡水明   

  1. Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China, Hefei 230026, China
  • 收稿日期:2014-12-02 修回日期:2015-02-04 出版日期:2015-05-05 发布日期:2015-05-05
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 91436209, 21225314, and 91221304) and Chinese Academy of Sciences (Grant No. XDB01020000).

Optical determination of the Boltzmann constant

Cheng Cun-Feng (程存峰), Sun Y. R. (孙羽), Hu Shui-Ming (胡水明)   

  1. Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China, Hefei 230026, China
  • Received:2014-12-02 Revised:2015-02-04 Online:2015-05-05 Published:2015-05-05
  • Contact: Hu Shui-Ming E-mail:smhu@ustc.edu.cn
  • About author:33.20.Ea; 31.30.J-
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 91436209, 21225314, and 91221304) and Chinese Academy of Sciences (Grant No. XDB01020000).

摘要: The Boltzmann constant kB is a fundamental physical constant in thermodynamics. The present CODATA recommended value of kB is 1.3806488(13)× 10-23 J/K (relative uncertainty 0.91 ppm), which is mainly determined by acoustic methods. Doppler broadening thermometry (DBT) is an optical method which determines kBT by measuring the Doppler width of an atomic or molecular transition. The methodology and problems in DBT are reviewed, and DBT measurement using the sensitive cavity ring-down spectroscopy (CRDS) is proposed. Preliminary measurements indicate that CRDS-based DBT measurement can potentially reach an accuracy at the 1 ppm level.

关键词: Boltzmann constant, Doppler broadening thermometry, metrology

Abstract: The Boltzmann constant kB is a fundamental physical constant in thermodynamics. The present CODATA recommended value of kB is 1.3806488(13)× 10-23 J/K (relative uncertainty 0.91 ppm), which is mainly determined by acoustic methods. Doppler broadening thermometry (DBT) is an optical method which determines kBT by measuring the Doppler width of an atomic or molecular transition. The methodology and problems in DBT are reviewed, and DBT measurement using the sensitive cavity ring-down spectroscopy (CRDS) is proposed. Preliminary measurements indicate that CRDS-based DBT measurement can potentially reach an accuracy at the 1 ppm level.

Key words: Boltzmann constant, Doppler broadening thermometry, metrology

中图分类号:  (Infrared spectra)

  • 33.20.Ea
31.30.J- (Relativistic and quantum electrodynamic (QED) effects in atoms, molecules, and ions)