A5057674840- Spectroscopy and Laser Applications
- Atmospheric Ozone and Climate
- Atomic and Subatomic Physics Research
- Cold Atom Physics and Bose-Einstein Condensates
- Atmospheric and Environmental Gas Dynamics
- Advanced Frequency and Time Standards
- Advanced Chemical Physics Studies
- Advanced Fiber Laser Technologies
- Atomic and Molecular Physics
- Laser Design and Applications
- Quantum, superfluid, helium dynamics
- Molecular Spectroscopy and Structure
- Quantum optics and atomic interactions
- Atmospheric chemistry and aerosols
- Laser-induced spectroscopy and plasma
- Spectroscopy Techniques in Biomedical and Chemical Research
- Spectroscopy and Quantum Chemical Studies
- Porphyrin and Phthalocyanine Chemistry
- Particle accelerators and beam dynamics
- Magnetic confinement fusion research
- Nuclear Physics and Applications
- Phase Equilibria and Thermodynamics
- Dark Matter and Cosmic Phenomena
- Scientific Measurement and Uncertainty Evaluation
- Ionosphere and magnetosphere dynamics
Institute of Physics
2016-2025
Nicolaus Copernicus University
2016-2025
Czech Academy of Sciences, Institute of Physics
2017-2023
Kazimierz Wielki University in Bydgoszcz
2021
Université de Rennes
2021
Centre National de la Recherche Scientifique
2021
National Institute of Standards and Technology
2018-2021
University of Colorado Boulder
2018-2021
Stony Brook University
2021
Politecnico di Milano
2021
This paper describes the contents of 2016 edition HITRAN molecular spectroscopic compilation. The new replaces previous 2012 and its updates during intervening years. absorption compilation is composed five major components: traditional line-by-line parameters required for high-resolution radiative-transfer codes, infrared cross-sections molecules not yet amenable to representation in a form, collision-induced data, aerosol indices refraction, general tables such as partition sums that apply...
The HITRAN database is a compilation of molecular spectroscopic parameters. It was established in the early 1970s and used by various computer codes to predict simulate transmission emission light gaseous media (with an emphasis on terrestrial planetary atmospheres). composed five major components: line-by-line parameters required for high-resolution radiative-transfer codes, experimental infrared absorption cross-sections (for molecules where it not yet feasible representation form),...
We report on the first earth-scale quantum sensor network based optical atomic clocks aimed at dark matter (DM) detection. Exploiting differences in susceptibilities to fine-structure constant of essential parts an clock, i.e. cold atoms and reference cavity, we can perform sensitive searches for signatures without need real-time comparisons clocks. a two orders magnitude improvement constraints transient variations constant, which considerably improves detection limit standard model (SM) -...
A novel experimental scheme enabling the investigation of transient exotic spin couplings is discussed. The based on synchronous measurements optical‐magnetometer signals from several devices operating in magnetically shielded environments distant locations (≳ 100 km). Although signatures such may be present signal a single magnetometer, it would challenging to distinguish them noise. By analyzing correlation between multiple, geographically separated magnetometers, not only possible...
Recent developments in optical metrology have tremendously improved the precision and accuracy of horizontal (frequency) axis measured spectra. However, vertical (typically absorbance) is usually based on intensity measurements that are subject to instrumental errors which limit spectrum accuracy. Here we report a one-dimensional spectroscopy uses only frequencies high-finesse cavity modes provide complete information about dispersive properties spectrum. Because this technique depends...
Abstract Frequency combs have revolutionized optical frequency metrology, allowing one to determine highly accurate transition frequencies of a wealth molecular species. These progresses only marginally benefited infrared-inactive transitions, due their inherently weak cross-sections. Here we overcome this limitation by introducing stimulated-Raman-scattering where comb is exploited calibrate the detuning between pump and Stokes excitation lasers. We apply approach investigation hydrogen,...
Measuring low light absorption with combined uncertainty <1 per mil (‰) is crucial for many applications. Popular cavity ring-down spectroscopy can provide ultrahigh precision, below 0.01‰, but its accuracy often worse than 5‰ due to inaccuracies in intensity measurements. To eliminate this problem, we exploit optical frequency information carried by the electromagnetic field. Instead of measuring only decaying intensity, perform heterodyne detection ring-downs followed Fourier analysis...
Spectrometers based on high-finesse optical cavities have proven to be powerful tools for applied and fundamental studies. Extending this technology the deep cryogenic regime is beneficial in many ways: Doppler broadening reduced, peak absorption enhanced, Boltzmann distribution of rotational states narrowed, all unwanted molecular species disturbing spectra are frozen out, dense complex polyatomic molecules become easier assign. We demonstrate a cavity-enhanced spectrometer fully operating...
Absolute frequencies of unperturbed (12)C(16)O transitions from the near-infrared (3-0) band were measured with uncertainties five-fold lower than previously available data. The frequency axis spectra was linked to primary standard. Three different cavity enhanced absorption and dispersion spectroscopic methods various approaches data analysis used estimate potential systematic instrumental errors. Except for a well established frequency-stabilized ring-down spectroscopy, we applied...
Temperature dependences of molecular line-shape parameters are important for the spectroscopic studies atmospheres Earth and other planets. A number analytical functions have been proposed as candidates that may approximate actual temperature parameters. In this article, we use our ab initio collisional calculations several systems to compare four ranges (4TR) representation, adopted in HITRAN database [J. Quant. Spectrosc. Radiat. Transfer 2017;203:3] 2016, with double-power-law (DPL)...
We report the most accurate measurement of position weak quadrupole S(2) 2-0 line in D$_2$. The spectra were collected with a frequency-stabilized cavity ring-down spectrometer (FS-CRDS) an ultra-high finesse optical ($\mathcal{F}$ = 637 000) and operating frequency-agile, rapid scanning spectroscopy (FARS) mode. Despite working Doppler-limited regime, we reached 40 kHz statistical uncertainty 161 absolute accuracy, achieving highest accuracy for homonuclear isotopologues molecular hydrogen....
A spectroscopic method free from systematic errors is desired for many challenging applications of gas detection. Although existing cavity-enhanced techniques exhibit very high precision, their accuracy strongly depends on propagation the light amplitude through an optical system and its Here, we demonstrate that frequency-based molecular dispersion spectroscopy, involving sub-Hz-level precision in frequency measurements cavity resonances, leads to sub-per-mille a wide dynamic range, both...
Fully quantum ab initio calculations of the collision-induced shapes two rovibrational ${\mathrm{H}}_{2}$ lines perturbed by He provide an unprecedented subpercent agreement with ultra-accurate cavity-enhanced measurements. This level consistency between theory and experiment hinges on a highly accurate potential energy surface realistic treatment velocity changing dephasing collisions. In addition to fundamental importance, these results show that can reference data for spectroscopic...
Context. The collisional (de-)excitation of H 2 by He plays an important role in the thermal balance and chemistry various astro-physical environments, making accurate rate coefficients essential for interpreting observations interstellar medium. Aims. Our goal is to utilize a state-of-the-art potential energy surface (PES) provide comprehensive state-to-state He-induced transitions among rovibrational levels . Methods. We performed quantum scattering calculations -He system. Thus, we were...
We show how to effectively introduce a proper description of the velocity-changing collisions into model isolated molecular transition for case self- and Ar-perturbed H2. demonstrate that billiard-ball (BB) approximation H2-H2 H2-Ar potentials gives an accurate collisions. The BB results are compared with ab initio classical dynamics simulations. It is shown correctly reproduces not only principal properties such as frequencies or collision kernels, but also other characteristics gas...
The iterative approach to the line-shape calculations from transport-relaxation equation was modified allow its application for low pressures down Doppler limit. In our functions and operators are decomposed in Burnett basis. This technique applied experimental data presenting consistency between model measured spectrum corresponding a signal-to-noise ratio higher than $9\ifmmode\times\else\texttimes\fi{}{10}^{4}$. Implications precise molecular spectroscopy as well Doppler-width thermometry...