53 research outputs found
The HITRAN2020 Molecular Spectroscopic Database
The HITRAN database is a compilation of molecular spectroscopic parameters. It was established in the early 1970s and is used by various computer codes to predict and simulate the transmission and emission of light in gaseous media (with an emphasis on terrestrial and planetary atmospheres). The HITRAN compilation is composed of five major components: the line-by-line spectroscopic parameters required for high-resolution radiative-transfer codes, experimental infrared absorption cross-sections (for molecules where it is not yet feasible for representation in a line-by-line form), collision-induced absorption data, aerosol indices of refraction, and general tables (including partition sums) that apply globally to the data. This paper describes the contents of the 2020 quadrennial edition of HITRAN. The HITRAN2020 edition takes advantage of recent experimental and theoretical data that were meticulously validated, in particular, against laboratory and atmospheric spectra. The new edition replaces the previous HITRAN edition of 2016 (including its updates during the intervening years).
All five components of HITRAN have undergone major updates. In particular, the extent of the updates in the HITRAN2020 edition range from updating a few lines of specific molecules to complete replacements of the lists, and also the introduction of additional isotopologues and new (to HITRAN) molecules: SO, CH3F, GeH4, CS2, CH3I and NF3. Many new vibrational bands were added, extending the spectral coverage and completeness of the line lists. Also, the accuracy of the parameters for major atmospheric absorbers has been increased substantially, often featuring sub-percent uncertainties. Broadening parameters associated with the ambient pressure of water vapor were introduced to HITRAN for the first time and are now available for several molecules.
The HITRAN2020 edition continues to take advantage of the relational structure and efficient interface available at www.hitran.org and the HITRAN Application Programming Interface (HAPI). The functionality of both tools has been extended for the new edition
Spectroscopic constants of spherical top molecules. q2 J2 and q 2 J3 terms for interacting states 1000, 0010 and 0100, 0001 of ab4 molecules
The effective Hamiltonians in terms of irreducible tensor operators for interacting states 0100, 0001 and 1000, 0010 of tetrahedral molecules AB 4 are considered. The formulas for spectroscopic parameters tΩ S,S(κ,Γ)ΓsΓs', coefficients of tensor operators of the type q2 J2 and q 2 J3, are derived.On considère les Hamiltoniens effectifs, en termes d'opérateurs tensoriels irréductibles, pour les états en interaction 0100, 0001 et 1000, 0010 de molécules tétraédriques AB4. On établit les formules donnant les paramètres spectroscopiques tΩS,S(K,Γ)ΓsΓs', coefficients des opérateurs tensoriels de type q2 J2 et q2 J3
Erratum - Spectroscopic constants of spherical top molecules. q 2J2 and q2J3 terms for interacting states 1000, 0010 and 0100, 0001 of AB4 molecules
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High sensitivity cavity ring down spectroscopy of the ν1 + 4ν3 band of NO2 near 1.34 µm
International audienc
High sensitivity Cavity Ring Down Spectroscopy of the 2ν 1 + 3ν 2 + ν 3 band of NO 2 near 1.57 µm
International audienc
High sensitivity cavity ring down spectroscopy of the 4ν 3 band of NO 2 near 1.59 µm
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High sensitivity cavity ring down spectroscopy of N2O near 1.22µm: (II) 14N216O line intensity modeling and global fit of 14N218O line positions
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Analysis and theoretical modeling of 18 O enriched carbon dioxide spectrum by CRDS near 1.35 ÎĽm: (II) 16 O 13 C 18 O, 16 O 13 C 17 O, 12 C 18 O 2 , 17 O 12 C 18 O, 12 C 17 O 2 , 13 C 18 O 2 and 17 O 13 C 18 O
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High sensitivity Cavity Ring Down Spectroscopy of N2O near 1.22ÎĽm: (I) Rovibrational assignments and band-by-band analysis
International audienc
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