Modeling of Collision-Induced Absorption Spectra of H2-H2 Pairs for the Planetary Atmospheres Structure: The Second Overtone Band

Details Modeling of Collision-Induced Absorption Spectra of H2-H2 Pairs for the Planetary Atmospheres Structure: The Second Overtone Band Modeling of Collision-Induced Absorption Spectra of H2-H2 Pairs for the Planetary Atmospheres Structure: The Second Overtone Band

Jul 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997dps....29.1518f&link_type=abstract

American Astronomical Society, DPS meeting #29, #15.18; Bulletin of the American Astronomical Society, Vol. 29, p.995

Astronomy and Astrophysics

Astronomy

Scientific paper

Collision induced absorption (CIA) is known to constitute the major component of the opacity of outer planets. The work is of interest for modeling the atmospheres of Uranus and Neptune. The spectra, centred around .83 mu m, correspond to the rotovibrational (RV) CIA in the second overtone band (3-0) of H_2-H_2 pairs, and are needed to further constrain the vertical atmospheric structure of Uranus and Neptune. Improved H_2-H_2 3-0 RV CIA data (intensity and spectral band shape) will be particularly important for that study. The second overtone band of the RV CIA spectra is related with a vibrational single transition (v_1,v_2 = 0,0 -> 0,3) and double transitions (0,0 -> 1,2), where vi are the vibrational quantum numbers of two interacting H2 molecules (i=1 or 2). The quantum mechanical methods are employed to compute the spectra of 3-0 RV CIA of H_2-H_2 pairs, with newly developed ab initio induced dipole moments [1] taken into account. Our preliminary results also show good agreement with the existing experimental data. More work is currently underway and we expect the new results to be better than those presented here. Future model of 3-0 spectra at the temperature range 20-300 K will be distributed freely to all interested planetary scientists. Acknowledgements: The support by Planetary Atmosphere Division of NASA is gratefully acknowledged. [0.1in] %Partial support by NASA, Planetary Atmospheres Program, %grant NAGW-10-74507 is gratefully acknowledged. [0.1in] [1] C. Zheng and A. Borysow, unpublished.

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