Frequency metrology of the acetylene lines near 789 nm from lamb-dip measurements

Tao, Lei-Gang; Hua, Tian-Peng; Sun, Yuxi; Wang, Jin; Liu, Anwen; Hu, Shui-Ming

doi:10.1016/j.jqsrt.2018.02.021

Cited by 16 publications

(21 citation statements)

References 37 publications

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“…It must be noted that the pressure-induced shift reported in the Doppler regime for a line of the same vibrational band, namely the P14e transition at 7183.388 97 cm −1 , was −1.996(4) kHz Pa −1 [21], which is far from the value reported in this paper. A similar mismatch has been already observed in a previous study on C 2 H 2 [14], and also for other molecules such as CO [28,29] and H 2 O [30,31].…”

Section: Resultssupporting

confidence: 89%

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Lamb-dip cavity ring-down spectroscopy of acetylene at 1.4 μm

et al. 2021

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Doppler-free saturated-absorption Lamb dips are observed for weak vibration-rotation transitions of C2H2 between 7167 and 7217 cm−1, using a frequencycomb assisted cavity ring-down spectrometer based on the use of a pair of phase-locked diode lasers. We measured the absolute center frequency of sixteen lines belonging to the 2ν3 + ν15 band, targeting ortho and para states of the molecule. Line pairs of the P and Q branches were selected so as to form a “V”-scheme, sharing the lower energy level. Such a choice made it possible to determine the rotational energy separations of the excited vibrational state for J-values from 11 to 20. Line-center frequencies are determined with an overall uncertainty between 2 and 13 kHz. This is over three order of magnitude more accurate than previous experimental studies in the spectral region around the wavelength of 1.4 μm. The retrieved energy separations provide a stringent test of the so-called MARVEL method recently applied to acetylene.

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Section: Resultssupporting

confidence: 89%

“…This experimental strategy has been recently implemented to perform Lamb-dip frequency measurements on the ν 1 + ν 3 band near 1.5 μm [12,13]. Similarly, much weaker lines of the ν 1 + 3ν 3 band at 0.789 μm have been saturated [14].…”

Section: Introductionmentioning

confidence: 99%

Lamb-dip cavity ring-down spectroscopy of acetylene at 1.4 μm

et al. 2021

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“…Note that the pressure induced shift was reported to be -3.3 kHz/Pa from the Doppler broadened spectra [43], which is considerably larger than the result observed here. Eliminated pressure-induced line shifts in Lamb-dip measurements at low pressures were also observed for different transitions of quite a few molecules [32,34,44]. Taking into account the difference between the weighted average and linear fit of the positions obtained at different pressures, we give an uncertainty of 0.5 kHz for the contribution from the pressure dependence of the line center.…”

Section: Resultsmentioning

confidence: 79%

“…In general, the NICE-OHMS technique is more sensitive than CEAS and CRDS, but as far as we know, there is no metrology study using NICE-OHMS toward an accuracy around 1 kHz in the near-IR region. In this paper, we report a comparison between NICE-OHMS and CRDS in metrology study of molecules, by measuring the Doppler-free saturated absorption spectrum of an acetylene line near 789 nm which has been recently measured by CRDS [34]. As will be shown in the following sections, the NICE-OHMS technique, being more sensitive than the relatively simple CRDS technique, needs dedicated investigations of various experimental conditions to eliminate systematic uncertainties, before it could be used as a technique for frequency metrology of molecules.…”

Section: Introductionmentioning

confidence: 99%

Frequency metrology of molecules in the near-infrared by NICE-OHMS

Hua¹,

Sun²,

Wang³

et al. 2019

Opt. Express

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Noise-immune cavity enhanced optical heterodyne molecular spectroscopy (NICE-OHMS) is extremely sensitive in detecting weak absorption. However, the use of NICE-OHMS for metrology study was also hindered by its sensitivity to influence from various experimental conditions such as the residual amplitude modulation. Here we demonstrate to use NICE-OHMS for precision measurements of Lamb-dip spectra of molecules. After a dedicated investigation of the systematic uncertainties in the NICE-OHMS measurement, the transition frequency of a ro-vibrational line of C 2 H 2 near 789 nm was determined to be 379 639 280 915.3±1.2 kHz (fractional uncertainty 3.2 × 10 −12), agreeing well with, but more accurate than, the value determined from previous cavity ring-down spectroscopy measurements. The study indicates the possibility to implement the very sensitive NICE-OHMS method for frequency metrology of molecules, or a molecular clock, in the near-infrared.

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“…The line list can be improved by augmenting the Marvel analysis of Chubb et al (2018c) and then inserting the resulting energy levels in aCeTY; this would ensure that energies and associated transition wavenumbers are at the current limit of accuracy. The highaccuracy experiments of Tao et al (2018) and Liu et al (2013) (which was not included in Chubb et al (2018c)) demonstrates that updates should be made to the ν1 + 3ν3 band included in the Marvel analysis of 12 C2H2.…”

Section: Summary and Future Workmentioning

confidence: 99%

ExoMol molecular line lists – XXXVII. Spectra of acetylene

Chubb

Tennyson

Yurchenko

2020

Monthly Notices of the Royal Astronomical Society

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A new ro-vibrational line list for the ground electronic state of the main isotopologue of acetylene, 12 C 2 H 2 , is computed as part of the ExoMol project. The aCeTY line list covers the transition wavenumbers up to 10 000 cm −1 (λ > 1 µm), with lower and upper energy levels up to 12 000 cm −1 and 22 000 cm −1 considered, respectively. The calculations are performed up to a maximum value for the vibrational angular momentum, K max = L max = 16, and maximum rotational angular momentum, J = 99. Higher values of J were not within the specified wavenumber window. The aCeTY line list is considered to be complete up to 2200 K, making it suitable for use in characterising high-temperature exoplanet or cool stellar atmospheres. Einstein-A coefficients, which can directly be used to calculate intensities at a particular temperature, are computed for 4.3 billion (4 347 381 911) transitions between 5 million (5 160 803) energy levels. We make comparisons against other available data for 12 C 2 H 2 , and demonstrate this to be the most complete line list available. The line list is available in electronic form from the online CDS and ExoMol databases.

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Frequency metrology of the acetylene lines near 789 nm from lamb-dip measurements

Cited by 16 publications

References 37 publications

Lamb-dip cavity ring-down spectroscopy of acetylene at 1.4 μm

Lamb-dip cavity ring-down spectroscopy of acetylene at 1.4 μm

Frequency metrology of molecules in the near-infrared by NICE-OHMS

ExoMol molecular line lists – XXXVII. Spectra of acetylene

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