Measuring the Boltzmann constant by mid-infrared laser spectroscopy of ammonia

Mejri, Sinda; Sow, Papa Gallo; Kozlova, Olga; Ayari, C.; Tokunaga, S. K.; Chardonnet, Christian; Briaudeau, S.; Darquié, Benoît; Rohart, F.; Daussy, Christophe

doi:10.1088/0026-1394/52/5/s314

Cited by 30 publications

(20 citation statements)

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“…There is a demand for precise spectroscopy of increasingly complex molecules. Precise knowledge of molecular constants is required for modeling our atmosphere [1,2], interpreting astrophysical and planetary spectra [3], studying collision physics [4,5], and testing fundamental physics, including tests of fundamental symmetries [6][7][8][9][10], and measurements of fundamental constants [11,12] and their possible variation [13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

High-resolution mid-infrared spectroscopy of buffer-gas-cooled methyltrioxorhenium molecules

et al. 2017

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We demonstrate cryogenic buffer-gas cooling of gas-phase methyltrioxorhenium (MTO). This molecule is closely related to chiral organometallic molecules where the parity-violating energy differences between enantiomers is measurable. The molecules are produced with a rotational temperature of approximately 6 K by laser ablation of an MTO pellet inside a cryogenic helium buffer gas cell. Facilitated by the low temperature, we demonstrate absorption spectroscopy of the 10.2 μm antisymmetric Re=O stretching mode of MTO with a resolution of 8 MHz and a frequency accuracy of 30 MHz. We partially resolve the hyperfine structure and measure the nuclear quadrupole coupling of the excited vibrational state. Our ability to produce dense samples of complex molecules of this type at low temperatures represents a key step towards a precision measurement of parity violation in a chiral species.

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Section: Introductionmentioning

confidence: 99%

High-resolution mid-infrared spectroscopy of buffer-gas-cooled methyltrioxorhenium molecules

et al. 2017

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“…For example, precise knowledge of molecular constants is required for modeling atmospheres, whether it be our own 1,2 or those found in exo-planets 3 and in the interstellar medium 4 , for studying collision physics 5,6 , and as crucial groundwork for performing fundamental physics tests 7,8,9,10,11,12,13,14,15,16,17 . One such test is the measurement of the parity-violating (PV) energy difference between opposite enantiomers of a chiral molecule, induced by the weak interaction.…”

Section: Iintroductionmentioning

confidence: 99%

Characterising molecules for fundamental physics: an accurate spectroscopic model of methyltrioxorhenium derived from new infrared and millimetre-wave measurements

Asselin

Berger

Huet

et al. 2017

Phys. Chem. Chem. Phys.

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Following our first paper about high resolution spectroscopy of methyltrioxorhenium (MTO) [Stoeffler et al. PCCP, 13, 854, (2011)], the present study reports a deeper investigation of the ground state, and Re=O antisymmetric (as) and symmetric (s) stretching excited states of both CH3 187 ReO3 and CH3 185 ReO3 isotopologues, thanks to new devices implemented within our consortium. We carry out high resolution millimeter-wave (MMW) and infrared (IR) spectroscopy in room temperature absorption cells, in a pulsed supersonic jet and in a cryogenic buffer gas cell. This collection of sensitive spectrometers enables us to probe both levels of a vibrational transition in low and room temperature gaseous environments. We thus report a new series of measurements providing particularly accurate rotational and rovibrational data for such a large and heavy organometallic molecule that is solid at room temperature.The combination of the new MMW and IR data leads to an improvement of the rovibrational model of MTO: (i) rotational spectra are extended to the 150-300 GHz range and are analyzed to characterize the ground state rotational and hyperfine structure up to J = 43 and K = 41, resulting in the significant refinement of rotational, quartic and hyperfine parameters, as well as the determination of sextic parameters and a centrifugal distortion correction to the quadrupolar hyperfine constant,(ii) rovibrational data recorded at very different temperatures (between 6 and 300 K) in the 970-1015 cm -1 range, at resolutions down to 8 MHz and frequency accuracies as high as 30 MHz (using the buffer gas technique), are used in a first step to extract more precise excited-state rotational, Coriolis and quartic parameters as well as the ground-state centrifugal distortion parameter of the 187 Re isotopologue, which isn't accessible from rotational spectroscopy alone. In a second step, taking the hyperfine structure into account, the upper state rhenium atom quadrupole coupling constant eQq' is determined from the assignment of partially hyperfine-resolved CO2 laser absorption spectra of a skimmed molecular beam.* now at National Physical Laboratory, Teddington, TW11 0LW, UK. 2 IIntroductionThere is an increasing demand for precision spectroscopy of polyatomic molecules. For example, precise knowledge of molecular constants is required for modeling atmospheres, whether it be our own 1,2 or those found in exo-planets 3 and in the interstellar medium 4 , for studying collision physics 5,6 , and as crucial groundwork for performing fundamental physics tests 7,8,9,10,11,12,13,14,15,16,17 . One such test is the measurement of the parity-violating (PV) energy difference between opposite enantiomers of a chiral molecule, induced by the weak interaction. 18 The chiral derivatives of methyltrioxorhenium (MTO) are excellent candidate species for this measurement, because calculations predict relatively large PV energy differences, and because it is possible to synthesize these molecules and bring them into the gas phase. 8,17,19,20 In...

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“…Therefore, having characterised the atoms with one probe beam, we would be able to fit to experimental data of the transmission of the other probe beam in order to measure the decay rate of the transition. This two beam method could also prove useful in experiments in which the temperature of an atomic vapour must be known accurately, such as experiments attempting to measure the Boltzmann constant from the Doppler-width of an absorption feature [55,56].…”

Section: Future Experimentsmentioning

confidence: 99%

Absolute absorption on the potassium D lines: theory and experiment

Hanley

Gregory

Hughes

et al. 2015

J. Phys. B: At. Mol. Opt. Phys.

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We present a detailed study of the absolute Doppler-broadened absorption of a probe beam scanned across the potassium D lines in a thermal vapour. Spectra using a weak probe were measured on the 4S → 4P transition and compared to the theoretical model of the electric susceptibility detailed by Zentile et al (2015) in the code named ElecSus. Comparisons were also made on the 4S → 5P transition with an adapted version of ElecSus. This is the first experimental test of ElecSus on an atom with a ground state hyperfine splitting smaller than that of the Doppler width. An excellent agreement was found between ElecSus and experimental measurements at a variety of temperatures with rms errors ∼ 10 −3 . We have also demonstrated the use of ElecSus as an atomic vapour thermometry tool, and present a possible new measurement technique of transition decay rates which we predict to have a precision of ∼ 3 kHz. arXiv:1506.06651v1 [physics.atom-ph]

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Measuring the Boltzmann constant by mid-infrared laser spectroscopy of ammonia

Cited by 30 publications

References 50 publications

High-resolution mid-infrared spectroscopy of buffer-gas-cooled methyltrioxorhenium molecules

High-resolution mid-infrared spectroscopy of buffer-gas-cooled methyltrioxorhenium molecules

Characterising molecules for fundamental physics: an accurate spectroscopic model of methyltrioxorhenium derived from new infrared and millimetre-wave measurements

Absolute absorption on the potassium D lines: theory and experiment

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