Trajectory-based Simulation of Far-infrared Collision-induced Absorption Profiles of CH4–N2 for Modeling Titan’s Atmosphere

Finenko, A.A.; Bézard, B.; Gordon, I.E.; Chistikov, D.N.; Lokshtanov, S.E.; Petrov, S.V.; Vigasin, A.A.

Статья опубликована в высокорейтинговом журнале

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Дата последнего поиска статьи во внешних источниках: 4 марта 2022 г.

Авторы: Finenko Artem A., Bézard Bruno, Gordon Iouli E., Chistikov Daniil N., Lokshtanov Sergei E., Petrov Sergey V., Vigasin Andrey A.
Журнал: Astrophysical Journal, Supplement Series
Том: 258
Номер: 2
Год издания: 2022
Издательство: University of Chicago Press
Местоположение издательства: United States
Первая страница: 33
DOI: 10.3847/1538-4365/ac36d3
Аннотация: We report the results of the trajectory-based simulation of far-infrared collision-induced absorption (CIA) due to CH4–N2 pairs at temperatures between 70 and 400 K. Our analysis utilizes recently calculated high-level potential energy and induced dipole surfaces. Treating collision partners as rigid rotors, the time evolution of interaction-induced dipole is accumulated over a vast ensemble of classical trajectories and subsequently transformed into a CIA spectrum via Fourier transform. In our calculations, both bound and unbound states are properly accounted for, and the rigorous theory of lower-order spectral moments is addressed to check the accuracy of simulated profiles. Classically derived trajectory-based profiles are subject to two approximate desymmetrization procedures so that resulting profiles conform to the quantum principle of detailed balance. The simulated profiles are compared to laboratory measurements and employed for modeling Titan's spectra in the 50–500 cm−1 range. Based on the desymmetrized simulated profiles, a new semiempirical model for CH4–N2 CIA is proposed for modeling Titan's infrared spectra. Synthetic spectra derived using this model yield an excellent agreement with the data recorded by the Composite Infrared Spectrometer aboard the Cassini spacecraft at low and high emission angles.
Добавил в систему: Финенко Артём Андреевич

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Trajectory-based Simulation of Far-infrared Collision-induced Absorption Profiles of CH4–N2 for Modeling Titan’s Atmosphereстатья

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