High Resolution Laboratory FTIR Spectroscopy at Planetary and Astrophysical Temperatures: Temperature Dependence of 13CH4 Line Shapes Broadened by N2

Details High Resolution Laboratory FTIR Spectroscopy at Planetary and Astrophysical Temperatures: Temperature Dependence of 13CH4 Line Shapes Broadened by N2 High Resolution Laboratory FTIR Spectroscopy at Planetary and Astrophysical Temperatures: Temperature Dependence of 13CH4 Line Shapes Broadened by N2

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21460012s&link_type=abstract

American Astronomical Society, AAS Meeting #214, #600.12

Astronomy and Astrophysics

Astrophysics

Scientific paper

We present engineering results obtained with a Michelson Interferometer (Bruker IFS-125HR) newly configured with a temperature stabilized cryogenic absorption cell that hangs from the top cover of the evacuated sample compartment. The cell has an optical path of 24.29 cm and a demonstrated temperature stability of better than 0.01 K at all temperatures between 300 K and 90 K. The cryogenic cell is mounted on the cold finger of a closed cycle helium refrigerator, and the temperatures are monitored with Si diode sensors. The wedged ZnSe cell windows are vacuum sealed with crushed indium gaskets.
To test the system performance, we first recorded spectra of the ν4 band of 13CH4 broadened by nitrogen at 0.0056 cm-1 instrumental resolution (Resolving power = 232000) using a HgCdTe detector . The 13CH4+N2 mixture pressures ranged from 140 to 796 torr with the volume mixing ratios of 13CH4 varying between 0.003 to 0.01 at 296, 255, 225 and 180 K. Line shape parameters of the R(4) manifold at 1324 cm-1 (7.55 μm) were retrieved using the nonlinear least squares multispectrum technique, fitting all spectra simultaneously to determine the temperature dependences for the 13CH4 nitrogen broadening and shift coefficients. The analysis of the entire band from 1200 to 1400 cm-1 (8.33 to 7.14 μm) is currently underway to support remote sensing of Titan.
This new spectroscopic capability at the Jet Propulsion Laboratory will enable future research in studies of planetary science and astrophysics.
The research at the Jet Propulsion Laboratory (JPL), California Institute of Technology, the College of William and Mary and Connecticut College was performed under contracts and grants with National Aeronautics and Space Administration.

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