Absolute frequency measurement of molecular iodine hyperfine transitions at 647  nm

Huang, Yao-Chin; Guan, Yuduo; Suen, Te-Hwei; Shy, Jow−Tsong; Wang, Li-Bang

doi:10.1364/ao.57.002102

Cited by 7 publications

(3 citation statements)

References 21 publications

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“…Pressure shifts of iodine lines are found to be in the range of 5 to 9 kHz Pa −1 . [26][27][28][29][30][31] With the vapor pressure temperature dependence of iodine being 14.9 Pa K −1 at about 45°C 33 (and increasing for higher temperatures), the pressure shift as a function of cell temperature can be estimated to be less than 10 cm s −1 K, consistent with FTS measurements. 22 This means that, by maintaining a temperature stability of better than 1 K, a 10 cm s −1 accuracy of the iodine spectrum can be achieved.…”

Section: Discussionsupporting

confidence: 75%

“…This model has been experimentally verified for multiple transitions, each at different wavelengths (534, 535, 548, 560, 647, and 671 nm) using LFCs. [26][27][28][29][30][31] The deviations to the model range from −3.6 to 2.2 MHz (corresponding to better than 2.5 m s −1 ) with measurement uncertainties typically in the range of 10 to 25 kHz (corresponding to better than 2 cm s −1 ). Although this shows that the model does not (yet) exhibit accuracy on the sub m s −1 level, the spectrum of iodine itself provides an accurate standard as illustrated by its recommended use as a practical realization of the meter by the Comité international des poids et mesures (CIPM).…”

Section: Discussionmentioning

confidence: 99%

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Toward 10 cm s−1 radial velocity accuracy on the Sun using a Fourier transform spectrometer

Debus,

Schäfer,

Reiners

2023

J. Astron. Telesc. Instrum. Syst.

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.The Institute for Astrophysics and Geophysics solar observatory is producing high-fidelity, ultra-high-resolution spectra (R > 500000) of the spatially resolved surface of the Sun using a Fourier transform spectrometer (FTS). The radial velocity (RV) calibration of these spectra is currently performed using absorption lines from Earth’s atmosphere, limiting the precision and accuracy. To improve the frequency calibration precision and accuracy, we use a Fabry–Pérot etalon (FP) setup that is an evolution of the CARMENES FP design and an iodine cell in combination. To create an accurate wavelength solution, the iodine cell is measured in parallel with the FP. The FP is then used to transfer the accurate wavelength solution provided by the iodine via a simultaneous calibration of solar observations. To verify the stability and precision of the FTS, we perform parallel measurements of the FP and an iodine cell. The measurements show an intrinsic stability of the FTS of a level of 1 m s − 1 over 90 h. The difference between the FP RVs and the iodine cell RVs show no significant trends during the same time span. The root mean square of the RV difference between the FP and iodine cell is 10.7 cm s − 1, which can be largely attributed to the intrinsic RV precisions of the iodine cell and the FP (10.2 and 1.0 cm s − 1, respectively). This shows that we can calibrate the FTS to a level of 10 cm s − 1, competitive with current state-of-the-art precision RV instruments. Based on these results, we argue that the spectrum of iodine can be used as an absolute reference to reach an RV accuracy of 10 cm s − 1.

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Section: Discussionsupporting

confidence: 75%

Section: Discussionmentioning

confidence: 99%

Toward 10 cm s−1 radial velocity accuracy on the Sun using a Fourier transform spectrometer

Debus,

Schäfer,

Reiners

2023

J. Astron. Telesc. Instrum. Syst.

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“…For example. iodine cells have long been used as a frequency reference in the infra-red due to the large number of well-characterized spectral lines in that range [25,26]. There are also examples of one atomic species being used as a frequency reference for another in precision measurement experiments, for example in [27].…”

Section: Introductionmentioning

confidence: 99%

Low-drift Zeeman shifted atomic frequency reference

Reed,

Šibalić,

Whiting

et al. 2018

Preprint

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We present a simple method for producing a low-drift atomic frequency reference based upon the Zeeman effect. Our Zeeman Shifted Atomic Reference 'ZSAR' is demonstrated to have tens of GHz tuning range, limited only by the strength of the applied field. ZSAR uses Doppler-free laser spectroscopy in a thermal vapor where the vapor is situated in a large, static and controllable magnetic field. We use a heated 85 Rb vapor cell between a pair of position-adjustable permanent magnets capable of applying magnetic fields up to ∼1 T. To demonstrate the frequency reference we use a spectral feature from the Zeeman shifted D1 line in 85 Rb at 795 nm to stabilize a laser to the 7S 1/2 → 23P 1/2 transition in atomic cesium, which is detuned by approximately 19 GHz from the unperturbed Rb transition. We place an upper bound on the stability of the technique by measuring a 2.5 MHz RMS frequency difference between the two spectral features over a 24 hour period. This versatile method could be adapted easily for use with other atomic species and the tuning range readily increased by applying larger magnetic fields.

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Application of saturation absorption spectroscopy to study the hyperfine structure of ²³⁵U and accurate ²³⁵U/²³⁸U isotope ratio determinations at 861.031 nm

Wei

Savukov

Castro

2021

J. Anal. At. Spectrom.

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Absolute frequency measurement of molecular iodine hyperfine transitions at 647 nm

Cited by 7 publications

References 21 publications

Toward 10 cm s−1 radial velocity accuracy on the Sun using a Fourier transform spectrometer

Toward 10 cm s−1 radial velocity accuracy on the Sun using a Fourier transform spectrometer

Low-drift Zeeman shifted atomic frequency reference

Application of saturation absorption spectroscopy to study the hyperfine structure of ²³⁵U and accurate ²³⁵U/²³⁸U isotope ratio determinations at 861.031 nm

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Absolute frequency measurement of molecular iodine hyperfine transitions at 647 nm

Cited by 7 publications

References 21 publications

Toward 10 cm s−1 radial velocity accuracy on the Sun using a Fourier transform spectrometer

Toward 10 cm s−1 radial velocity accuracy on the Sun using a Fourier transform spectrometer

Low-drift Zeeman shifted atomic frequency reference

Application of saturation absorption spectroscopy to study the hyperfine structure of 235U and accurate 235U/238U isotope ratio determinations at 861.031 nm

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Product

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Application of saturation absorption spectroscopy to study the hyperfine structure of ²³⁵U and accurate ²³⁵U/²³⁸U isotope ratio determinations at 861.031 nm