Title :
A spectroscopic determination of the Boltzmann constant
Author :
Hald, J. ; Nielsen, Lars ; Petersen, Jan C.
Author_Institution :
Danish Fundamental Metrol., Lyngby, Denmark
Abstract :
A new determination of the Boltzmann constant (kB) 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 kB, 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;
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
DOI :
10.1109/CLEOE-EQEC.2009.5192092
