Random walks with the 6420- and 6825-A features of methane: Lost in the wilderness

Computer Science

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Atmospheric Composition, Hydrogen, Methane, Neptune Atmosphere, Uranus Atmosphere, Line Spectra, Molecular Spectroscopy, Pressure Broadening, Quadrupoles, Spectroscopic Analysis

Scientific paper

A feature near 6420 A which appears in the spectra of Uranus and Neptune, and was recently detected in the spectrum of Titan is investigated. When originally identified, it was assigned to the pressure induced 4 to 0 band of molecular hydrogen. Not only did the wavelength agree--a small apparent shift was arm waved away, but when the feature was reduced using a dipole-induced strength, it gave results for H2 column densities consistent with best estimates for the sharp quadrupole lines. In studying the long path spectra of methane, that same feature was also present. A second similar problem exists with a Uranian feature--indeed, a general planetary feature centered near 6825 A.

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