A spectroscopic determination of the Boltzmann constant

Author

Hald, J. ; Nielsen, Lars ; Petersen, Jan C.

Author_Institution

Danish Fundamental Metrol., Lyngby, Denmark

fYear

2009

fDate

14-19 June 2009

Firstpage

1

Lastpage

1

Abstract

A new determination of the Boltzmann constant (k_B) is conducted using a spectroscopic measurement, through the collaboration of various metrological institutes within a European research programme. This study complements previous works by utilizing several molecular species and by determining the accurate gas temperature and linewidth. Moreover, a recursive least squares analysis of very large datasets is done in order to achieve a reliable combined uncertainty of k_B, which takes into account the full covariance matrix of all relevant quantities.

Keywords

constants; covariance matrices; least squares approximations; measurement uncertainty; spectral line breadth; spectrochemical analysis; Boltzmann constant; covariance matrix; gas temperature; measurement uncertainty; molecular linewidth; molecular species; recursive least squares analysis; spectroscopic determination; spectroscopic measurement; Collaborative work; Frequency; Kelvin; Laser stability; Metrology; Optical fibers; Power lasers; Spectroscopy; Temperature measurement; Uncertainty;

fLanguage

English

Publisher

ieee

Conference_Titel

Lasers and Electro-Optics 2009 and the European Quantum Electronics Conference. CLEO Europe - EQEC 2009. European Conference on

Conference_Location

Munich

Print_ISBN

978-1-4244-4079-5

Electronic_ISBN

978-1-4244-4080-1

Type

conf

DOI

10.1109/CLEOE-EQEC.2009.5192092

Filename

5192092