Closed-cycle He-cooled Absorption Cells Designed For A Bruker Ifs-125hr: First Results Between 79 - 297 K

Details Closed-cycle He-cooled Absorption Cells Designed For A Bruker Ifs-125hr: First Results Between 79 - 297 K Closed-cycle He-cooled Absorption Cells Designed For A Bruker Ifs-125hr: First Results Between 79 - 297 K

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010dps....42.4807s&link_type=abstract

American Astronomical Society, DPS meeting #42, #48.07; Bulletin of the American Astronomical Society, Vol. 42, p.970

Astronomy and Astrophysics

Astronomy

Scientific paper

Gas absorption cells specifically designed to achieve stable temperatures down to 66K were developed at Connecticut College to fit inside the sample compartment of an evacuated Bruker (IFS-125HR) Fourier Transform spectrometer (FTS) at the Jet Propulsion Laboratory. The temperature-controlled cooling by a closed-cycle helium refrigerator achieved a temperature stability of ±0.01 K. Such temperature control is essential to characterize the temperature dependence of line shapes at the very low temperatures found in outer planets and their moons. In operation, the effects of vibrations arising from the closed-cycle helium refrigerator upon the FTS spectra were minimized. Initial unwanted absorption features from cryo-deposits on the cell windows were eliminated by adding a separately-pumped vacuum shroud box around the coolable cell to isolate it from residual gases in the evacuated FTS chambers.
Using this setup, high resolution spectra of several methane isotopologues (12CH4, 13CH4 and 12CH3D) broadened by N2, were recorded in the 1230 to 1850 cm-1 spectral region. Initial analysis of the R(2) manifold of the v4 fundamental band of 13CH4 examined whether the N2-broadened half width coefficients follow a simple power-law temperature-dependence over the entire 80 - 296 K temperature range. The results from this work were published by Sung et al. [1].
Low-temperature spectra of ethane [2-3] and carbon monoxide have also been recorded.
This research is supported by NASA's Planetary Atmospheres Program.
[1] K. Sung et al., J. Mol. Spectrosc. (2010) doi:10.1016/j.jms.2010.05.004.
[2] V. Malathy Devi et al., JQSRT (2010) submitted.
[3] L. R. Brown et al., adjacent poster.

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