Propane on Titan

@article{Roe2003PropaneOT,
  title={Propane on Titan},
  author={Henry G. Roe and Thomas K. Greathouse and Matthew J. Richter and John Henry Lacy},
  journal={The Astrophysical Journal Letters},
  year={2003},
  volume={597},
  pages={L65 - L68}
}
We present the first observations of propane (C3H8) on Titan that unambiguously resolve propane features from other numerous stratospheric emissions. This is accomplished using a R = λ/δλ ≈ 105 spectrometer (the Texas Echelon Cross Echelle Spectrograph) to observe propane's ν26 rotation-vibration band near 748 cm-1. We find a best-fit fractional abundance of propane in Titan's stratosphere of (6.2 ± 1.2) × 10-7 in the altitude range to which we are sensitive (90-250 km or 13-0.24 mbar). 

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References

SHOWING 1-10 OF 30 REFERENCES
C3H8 and C3H4 in Titan's atmosphere
Four bands of propane C3H8 and two of methyl acetylene C3H4 have been identified in the Voyager IR spectrum of Titan. Stratospheric abundances of 2 × 10−5 for C3H8 and 3 × 10−8 for C3H4 have been
Tunable Diode Laser Spectra and Assignment of the 748 cm-1 Band of Propane
Abstract The rotational structure of the 748 cm-1 c-type CH2-rocking fundamental of propane was analysed using tunable diode laser (TDL) techniques. On grounds of a low-resolution Fourier transform
Photochemical modeling of Titan's atmosphere
TLDR
A new photochemical model of Titan's atmosphere which includes all the important compounds and reactions in spherical geometry from the surface to 1240 km is developed and is in a closer agreement with the abundances inferred from the Voyager infrared measurements at the equator than the Yung et al. results.
Seasonal Variations of Titan's Atmospheric Composition
In order to investigate seasonal variations of the composition of Titan’s low stratosphere, we developed a two-dimensional (latitude‐ altitude) photochemical and transport model. Large-scale
...
...