Intensity and pressure shift of the H2 /4,0/ S/1/ quadrupole line

Astronomy and Astrophysics – Astrophysics

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Gas Giant Planets, Hydrogen, Line Spectra, Molecular Spectra, Planetary Atmospheres, Pressure Broadening, Astronomical Spectroscopy, Jupiter Atmosphere, Planetary Composition, Quadrupoles

Scientific paper

Results are presented for two laboratory measurements of the intensity and central frequency of the (4, 0) S(1) quadrupole line of H2, which were made at pressures of 2.658 and 1.494 atm through a 0.456-km path length. It is found that the absolute line intensity is significantly lower than the value predicted from theoretical matrix elements but is essentially identical to the value derived by Rank et al. (1966). The central-frequency results are shown to verify the pressure shift predicted by McKellar (1974). It is concluded that hydrogen abundances estimated from the equivalent width of the (4,0) S(1) quadrupole line in the spectra of the outer planets will have to be revised upward by nearly a factor of 2.

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