Frequency-comb-calibrated Doppler broadening thermometry

Gatti, Davide; Mills, Andrew A.; Vizia, Maria Domenica De; Mohr, Christian; Hartl, Ingmar; Marangoni, Marco; Fermann, M. E.; Gianfrani, L.

doi:10.1103/physreva.88.012514

Cited by 8 publications

(5 citation statements)

References 21 publications

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“…Numerous examples include precise measurements of absolute line positions and molecular structure of I 2 , 18,19 the first comb-referenced measurements of line-shape profiles in 13 C acetylene, 20 the study of temperature and pressure dependence of line shapes in acetylene, 21,22 the precise measurements of CO 2 transition frequencies at 4.3 μm, 23,24 or the line-shape studies aimed at the redetermination of the Boltzmann constant. 25 The Pound-Drever-Hall locked frequency stabilized cavity ring-down spectrometer (PDH-locked FS-CRDS) 26 assisted by the OFC enabled determination of the absolute positions of the weak lines from the oxygen B band 27 and CO 2 lines 28 together with the self-shifting coefficients. It has allowed determination of absolute frequencies of Dopplerlimited optical transitions with accuracy of 1.2 MHz 27 or even 9 kHz.…”

Section: Introductionmentioning

confidence: 99%

Low-pressure line-shape study in molecular oxygen with absolute frequency reference

Domysławska

Wójtewicz

Cygan

et al. 2013

The Journal of Chemical Physics

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We present a line-shape analysis of the rovibronic R1 Q2 transition of the oxygen B band resolved by the Pound-Drever-Hall-locked frequency-stabilized cavity ring-down spectroscopy technique in the low pressure range. The frequency axis of the spectra is linked by the ultra-narrow diode laser to the optical frequency comb in order to measure the absolute frequency at each point of the recorded spectra. Experimental spectra are fitted with various line-shape models: the Voigt profile, the Galatry profile, the Nelkin-Ghatak profile, the speed-dependent Voigt profile, and the speed-dependent Nelkin-Ghatak profile with quadratic and hypergeometric approximations for the speed dependence of collisional broadening and shifting. The influences of Dicke narrowing, speed-dependent effects, and correlation between phase- and velocity-changing collisions on the line shape are investigated. Values of line-shape parameters, including the absolute frequency of the transition 435685.24828(46) GHz, are reported.

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Section: Introductionmentioning

confidence: 99%

Low-pressure line-shape study in molecular oxygen with absolute frequency reference

Domysławska

Wójtewicz

Cygan

et al. 2013

The Journal of Chemical Physics

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“…Frequency scans over 1 GHz were achieved by tuning the repetition rate of the comb, a span sufficiently large to acquire simultaneously the absorption profiles of the sR(6,2), sR (6,6), and sR(6,1) NH 3 lines in the 5-40 Pa pressure range at a temperature of 296 K. The analysis performed on 90 spectra resulted in a 50 ppm statistical uncertainty, with a reduction by 20 % of the correlation between Doppler and collisional width when moving from an unconstrained to a constrained case. Among the profiles tested for the analysis, SDVP resulted the most adequate, as it was the only providing a zero slope between retrieved temperature and integrated absorbance [81]. Systematic error sources were not investigated.…”

Section: Multiple Transition Dbtmentioning

confidence: 99%

Laser-Based Primary Thermometry: A Review

Gotti

Lamperti

Gatti

et al. 2021

Journal of Physical and Chemical Reference Data

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Laser-based primary thermometry was initiated almost 15 years ago by the proposal to determine the absolute temperature of a gas at thermodynamic equilibrium through the Doppler width of an associated absorption transition, exploiting the potentially very accurate measurement of an optical frequency to infer the elusive thermal energy of a molecular or atomic absorber. This approach, commonly referred to as Doppler broadening thermometry, has benefited across the years from substantial improvements, of both technical and fundamental nature, eventually reaching an accuracy of about 10 ppm on the temperature determination in the best cases. This is sufficient for Doppler broadening thermometry to play a significant role in the practical realization of the new kelvin, which follows the 2019's redefinition from a fixed value of the Boltzmann constant, and to tackle the challenge, among others, to quantify and possibly fix systematic uncertainties of the international ITS-90 temperature scale. This paper reviews and comparatively analyses methods and results achieved so far in the field of laser-based primary thermometry, also including spectroscopic approaches that leverage the temperature-dependent distribution of line intensities and related absorbances across the ro-vibrational band of a molecular sample. Although at an early stage of development, these approaches show a promising degree of robustness with respect to the choice of the line-shape model adopted for the fitting of the absorption spectra, which is a delicate aspect for all laser-based thermometers. We conclude identifying possible technical and scientific evolution axes of the current scenario.

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“…Figure 4 shows an example spectrum associated with three closely spaced NH 3 transitions, namely the sR(6,2), sR(6,6) and sR(6,1) lines of the ν 2 band. Temperature determinations have been demonstrated by using this approach, with a precision of five parts over 10 5 [ 64 ]. The experiment, however, was limited by a negative shift as large as two parts over 10 3 , probably ascribed to the occurrence of line-mixing effects [ 65 ].…”

Section: The Ammonia Experimentsmentioning

confidence: 99%

Linking the thermodynamic temperature to an optical frequency: recent advances in Doppler broadening thermometry

Gianfrani

2016

Phil. Trans. R. Soc. A.

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Laser spectroscopy in the linear regime of radiation–matter interaction is a powerful tool for measuring thermodynamic quantities in a gas at thermodynamic equilibrium. In particular, the Doppler effect can be considered a gift of nature, linking the thermal energy to an optical frequency, namely the line centre frequency of an atomic or molecular spectral line. This is the basis of a relatively new method of primary gas thermometry, known as Doppler broadening thermometry (DBT). This paper reports on the efforts that have been carried out, in the last decade, worldwide, to the end of making DBT competitive with more consolidated and accurate methodologies, such as acoustic gas thermometry and dielectric constant gas thermometry. The main requirements for low-uncertainty DBT, of both theoretical and technical nature, will be discussed, with a special focus on those related to the line shape model and to the frequency scale. A deep comparison among the different molecules that have been selected in successful DBT implementations is also reported. Finally, for the first time, to the best of my knowledge, the influence of refractive index effects is discussed.

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Frequency-comb-calibrated Doppler broadening thermometry

Cited by 8 publications

References 21 publications

Low-pressure line-shape study in molecular oxygen with absolute frequency reference

Low-pressure line-shape study in molecular oxygen with absolute frequency reference

Laser-Based Primary Thermometry: A Review

Linking the thermodynamic temperature to an optical frequency: recent advances in Doppler broadening thermometry

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