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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.

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At least 163 records · Page 9
All sourcesNASA NTRSDOE OSTI
NASA NTRS1972

Infrared spectra of molecules and materials of astrophysical interest

Vibrational spectra were studied from 400 to 33/cm for molecules which may be present in the atmosphere of Jovian planets. The microwave spectrum of cis glyoxal was studied. Sources of color variation in the Jovian atmosphere were analyzed in relation to molecular crystals. The low frequency modes of acetaldehyde and acetaldehyde-d sub 4 are discussed.

Durig, J. R.↗
NASA NTRS1973

Infrared spectra of the Galilean satellites of Jupiter.

Spectra of the four Galilean satellites from 1 to 4 microns were obtained with a Michelson interferometer. The spectra show that the albedo of Io is quite flat and shows no absorptions in the region observed. Europa and Ganymede have large amounts of water ice on their surface. Callisto shows some faint ice absorptions. Upper limits of 0.5 cm-atm (STP) corresponding to .00000006 atm partial surface pressure were set for CH4 and NH3 on all four satellites.

Fink, U.↗
NASA NTRS1972

The inference of temperature from the infrared spectra of planets.

The paper is concerned primarily with the determination of the temperature of planetary atmospheres from ground-based observations of the vibration-rotation spectra of their constituent gases. The paper is divided into two parts. The first is a discussion of the theoretical basis and analytical methods for the interpretation of planetary spectra formed by reflection of solar radiation, in the ideal case of a clear, nonscattering atmosphere; this is followed by a brief description of the effects of scattering in cloudy atmospheres on the formation of spectral lines and on the inferred temperatures. In the second part examples are given of the results which have been obtained for effective temperatures and thermal structures, for both the pure absorbing and the scattering cases, and these are compared with the results of flyby and entry probe measurements.

Farmer, C. B.↗
NASA NTRS1973

Infrared spectra of the Galilean satellites of Jupiter

Spectra of the four Galilean satellites from 1 to 4 microns were obtained with a Michelson interferometer. The spectra show that the albedo of Io is very nearly constant with wavelength; no absorptions are found in the region observed. Europa and Ganymede have large amounts of water ice on their surface. Callisto shows some faint ice absorptions. Upper limits of 0.5 cm-atm (STP) corresponding to 6 x 10 to the minus 8th power atm partial surface pressure were set for CH4 and NH3 on all four satellites.

Fink, U.↗
NASA NTRS1973

H2 quadrupole rotation-vibration lines in infrared spectra of cool stars

A discrepancy between results concerning the 2-0 band and the 1-0 band obtained by Spinrad (1966) and by other observers is considered, and preliminary results of a search for lines from the stronger 1-0 band are reported. The results are reviewed in the light of recent model-atmosphere calculations. It is suggested that alternative identifications for the 2-0 lines near 1 micron can be found and that the hydrogen molecule is a very minor contributor to these stellar features.

Lambert, D. L.↗
NASA NTRS1974

Infrared spectra of gamma-2 Velorum and zeta Puppis

Observations of gamma-2 Vel and zeta Pup are presented for the spectral region 5800-11,000 per cm, at resolutions of 2 and 4 per cm, respectively. This constitutes the first reported spectroscopy of a Wolf-Rayet star beyond 1.1 microns. The new spectral region contained numerous emission features for the WC8 component of gamma-2 Vel, but only the P-beta line in absorption for the O4f star zeta Pup. Line identifications are given for gamma-2 Vel and are shown to be consistent with visual spectroscopy. The species identified are H, He I-II, and C II-IV.

Barnes, T. G.↗