| Autor: |
Darquié Benoît, Mejri Sinda, Sow Papa Lat Tabara, Lemarchand Cyril, Triki Meriam, Tokunaga Sean K., Bordé Christian J., Chardonnet Christian, Daussy Christophe |
| Jazyk: |
angličtina |
| Rok vydání: |
2013 |
| Předmět: |
|
| Zdroj: |
EPJ Web of Conferences, Vol 57, p 02005 (2013) |
| Druh dokumentu: |
article |
| ISSN: |
2100-014X |
| DOI: |
10.1051/epjconf/20135702005 |
| Popis: |
Accurate molecular spectroscopy in the mid-infrared region allows precision measurements of fundamental constants. For instance, measuring the linewidth of an isolated Doppler-broadened absorption line of ammonia around 10 μm enables a determination of the Boltzmann constant kB. We report on our latest measurements. By fitting this lineshape to several models which include Dicke narrowing or speed-dependent collisional effects, we find that a determination of kB with an uncertainty of a few ppm is reachable. This is comparable to the best current uncertainty obtained using acoustic methods and would make a significant contribution to any new value of kB determined by the CODATA. Furthermore, having multiple independent measurements at these accuracies opens the possibility of defining the kelvin by fixing kB, an exciting prospect considering the upcoming redefinition of the International System of Units. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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