Collision-induced rotovibrational spectra of H2-He pairs from first principles

Physics – General Physics

Scientific paper

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Absorption Spectra, Dipole Moments, Helium, Hydrogen, Molecular Collisions, Vibrational Spectra, Abundance, Line Spectra, Molecular Rotation

Scientific paper

The work of Meyer and Frommhold (1986) is extended to obtain the collision-induced absorption (CIA) spectra involving vibrational transitions from the hydrogen ground state to the lowest excited vibrational state of H2. From the induced dipole components, the CIA spectra of the collisional complex of hydrogen and helium are computed in the fundamental band of hydrogen using an exact quantum formalism. Both the shape of the computed spectral profiles and the theoretical absolute intensity are found to agree with existing measurements at temperatures from 18-300 K, and the ability to obtain such spectra from theory at temperatures where no measurements exist may have consequences for research relating to the atmospheres of the giant planets and late-type stars.

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