title: Doppler broadening thermometry of acetylene and accurate measurement of the Boltzmann constant.
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).
authors.affiliation: Alberta Terrestrial Imaging Centre, Department of Physics and Astronomy, University of Lethbridge, 4401 University Drive, Lethbridge, Alberta T1K3M4, Canada.
authors.forename: R
authors.initials: R
authors.lastname: Hashemi
authors.affiliation: Alberta Terrestrial Imaging Centre, Department of Physics and Astronomy, University of Lethbridge, 4401 University Drive, Lethbridge, Alberta T1K3M4, Canada.
authors.forename: C
authors.initials: C
authors.lastname: Povey
authors.affiliation: Alberta Terrestrial Imaging Centre, Department of Physics and Astronomy, University of Lethbridge, 4401 University Drive, Lethbridge, Alberta T1K3M4, Canada.
authors.forename: M
authors.initials: M
authors.lastname: Derksen
authors.affiliation: Alberta Terrestrial Imaging Centre, Department of Physics and Astronomy, University of Lethbridge, 4401 University Drive, Lethbridge, Alberta T1K3M4, Canada.
authors.forename: H
authors.initials: H
authors.lastname: Naseri
authors.affiliation: Alberta Terrestrial Imaging Centre, Department of Physics and Astronomy, University of Lethbridge, 4401 University Drive, Lethbridge, Alberta T1K3M4, Canada.
authors.forename: J
authors.initials: J
authors.lastname: Garber
authors.affiliation: Alberta Terrestrial Imaging Centre, Department of Physics and Astronomy, University of Lethbridge, 4401 University Drive, Lethbridge, Alberta T1K3M4, Canada.
authors.forename: A
authors.initials: A
authors.lastname: Predoi-Cross