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Related Experiment Videos

Allene nu9 and nu10: Low-Temperature Measurements of Line Intensity.

Wang1, Sirota, Reuter

  • 1Joint Center for Earth Systems Technology, University of Maryland Baltimore County, 1000 Hilltop Circle, Baltimore, Maryland, 21250

Journal of Molecular Spectroscopy
|May 18, 1999
PubMed
Summary

Laboratory measurements of allene

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Crystal lattice and phase transitions in Na4TiP2O9 (NTP) and Na4.5FeP2O8(O,F) (NFP) superionic conductors as a function of high pressures and temperatures.

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Area of Science:

  • Planetary Science
  • Spectroscopy
  • Atmospheric Chemistry

Background:

  • Allene is a potential constituent of Titan's atmosphere.
  • Understanding allene abundance is crucial for Titan's atmospheric chemistry.
  • Laboratory measurements provide essential data for atmospheric models.

Purpose of the Study:

  • To measure laboratory intensity for the nu9 and nu10 bands of allene.
  • To determine transition dipole moments for allene spectral lines.
  • To provide accurate data for allene abundance studies in planetary atmospheres.

Main Methods:

  • High-resolution Fourier Transform Spectroscopy (FTS) was employed.
  • Spectra were recorded at 200 K, simulating Titan's atmospheric conditions.
  • A least-squares method was used to fit 505 nu9 and 687 nu10 line intensities.

Main Results:

  • Accurate transition dipole moments were determined for the nu9 and nu10 bands.
  • Integrated band intensities were calculated at 200 K.
  • Intensity values of 36 ± 4% cm⁻² atm⁻¹ for nu9 and 301 ± 4% cm⁻² atm⁻¹ for nu10 were obtained.

Conclusions:

  • The study provides critical spectroscopic data for allene.
  • These measurements will aid in determining allene abundance in Titan's atmosphere.
  • The findings contribute to a better understanding of Titan's atmospheric composition and chemistry.

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