1. Absolute frequency metrology of the CHF3 8.6-µm ro-vibrational spectrum at 10−11 level
- Author
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Gianluca Galzerano, Antonio Castrillo, Roberto Aiello, Paolo De Natale, Lisa Marta Molteni, Pasquale Maddaloni, Livio Gianfrani, Alessio Gambetta, Nicola Coluccelli, Edoardo Vicentini, Paolo Laporta, Vicentini, E., Maddaloni, P., Aiello, R., Gambetta, A., Coluccelli, N., Molteni, L. M., Castrillo, A., Gianfrani, L., De Natale, P., Laporta, P., and Galzerano, G.
- Subjects
Optical-frequency-comb-assisted absolute frequency metrology ,Physics ,Radiation ,010504 meteorology & atmospheric sciences ,Absolute frequency ,Wavelength-modulation Lamb-dip spectroscopy ,CHF3 ro-vibrational spectrum ,Vibrational spectrum ,ro-vibrational spectrum ,01 natural sciences ,Atomic and Molecular Physics, and Optics ,Metrology ,law.invention ,law ,Atomic physics ,Fourier transform infrared spectroscopy ,CHF ,Spectroscopy ,Quantum cascade laser ,Order of magnitude ,0105 earth and related environmental sciences - Abstract
An optical-frequency-comb-referenced quantum cascade laser is used to perform wavelength-modulation Lamb-dip spectroscopy on a large number of ro-vibrational transitions falling in the CHF3 upsilon(5) fundamental band at 8.6 mu m. The combined (statistical + systematic) fractional uncertainty in the absolute determination of the line-center frequencies ranges from 9 x 10(-11) down to 2 x 10(-11). This represents an improvement by more than two orders of magnitude, as compared to a recent and extensive study performed with a high-resolution FTIR spectrometer [1]. Our investigation realizes a sharpened knowledge of the CHF3 spectrum over a wide interval, also managing to accurately determine the positions of very close, previously unresolved multiple ro-vibrational components. (C) 2020 Elsevier Ltd. All rights reserved.
- Published
- 2020