The visible bands of ammonia - Band strengths, curves of growth, and the spatial distribution of ammonia on Jupiter

Details The visible bands of ammonia - Band strengths, curves of growth, and the spatial distribution of ammonia on Jupiter The visible bands of ammonia - Band strengths, curves of growth, and the spatial distribution of ammonia on Jupiter

Jan 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...235..285l&link_type=abstract

Astrophysical Journal, Part 1, vol. 235, Jan. 1, 1980, p. 285-293.

Astronomy and Astrophysics

Astrophysics

11

Ammonia, Jupiter Atmosphere, Spectral Bands, Altitude, Astronomical Spectroscopy, Spatial Distribution, Jupiter, Atmosphere, Ammonia, Bands, Distribution, Experiments, Spectrum, Methane, Element Ratios, Abundance, Wavelengths, Data, Procedure, Absorption, Observations, Carbon/Nitrogen, Latitudes, Pressure, Analysis, Resolution, Aerosols

Scientific paper

We report room-temperature laboratory studies of the 5520 Å (6ν1) and 6475 Å (5ν1) bands of self-broadened ammonia at column densities ranging from 1.7-435.7 meter-amagats (m-am). Detailed equivalent-width measurements at 24 different pressure-pathlength combinations corresponding to four pressures between 44 and 689 torr and pathlengths between 32 and 512 m are used to determine curves of growth and integrated band strengths. The band strengths for the (6ν1) and and 5ν1 overtones are 5520 Å: S = 0.096 ± 0.005 cm-1 (m-am)-1 and 6475 Å: S = 0.63 ± 0.03 cm-1 (m-am)-1, respectively.
Using these band strengths and curves of growth, we analyze new spatially resolved spectra of Jupiter showing a nonhomogeneous distribution of ammonia in the Jovian atmosphere. The observed variations in the CH4/NH3 mixing ratio are interpreted as evidence of altitude-dependent depletion of ammonia in the atmosphere.

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