Doppler broadening thermometry of acetylene and accurate measurement of the Boltzmann constant.
J Chem Phys
; 141(21): 214201, 2014 Dec 07.
Article
em En
| MEDLINE
| ID: mdl-25481135
ABSTRACT
In this paper, we present accurate measurements of the fundamental Boltzmann constant based on a line-shape analysis of acetylene spectra in the ν1 + ν3 band recorded using a tunable diode laser. Experimental spectra recorded at low pressures (0.25 - 9 Torr), have been analyzed using a Speed Dependent Voigt model that takes into account the molecular speed dependence effects. This line-shape model reproduces the experimental data with good accuracy and allows us to determine precise line-shape parameters for the P(25) transition of the ν1 + ν3 band. From the recorded spectra we obtained the Doppler-width and then determined the Boltzmann constant, k(B).
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MEDLINE
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En
Ano de publicação:
2014
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Article