Measurement of CH_3D Absorption Cross Sections, Pressure Broadening, and Shft Coefficients in the 1.65 μm Spectral Region by Using Continuous Ave Cavity Ring-Down Spectroscopy

Details Measurement of CH_3D Absorption Cross Sections, Pressure Broadening, and Shft Coefficients in the 1.65 μm Spectral Region by Using Continuous Ave Cavity Ring-Down Spectroscopy Measurement of CH_3D Absorption Cross Sections, Pressure Broadening, and Shft Coefficients in the 1.65 μm Spectral Region by Using Continuous Ave Cavity Ring-Down Spectroscopy

Jun 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011mss..conferb02t&link_type=abstract

"International Symposium On Molecular Spectroscopy, 66th Meeting, Held 20-24 June, 2011 at Ohio State University. http://molspec

Physics

Atmospheric Species

Scientific paper

Quantitative spectroscopy of CH_3D in the near-IR is of importance for an ongoing project to build an instrument to measure the H/D isotopic ratio of methane gas. Continuous-wave cavity ring-down spectroscopy (CRDS) has been used to examine the absorption cross sections, the pressure-broadening and pressure-shift coefficients at around 1652 nm. The absorption cross sections of CH_3D were quantified in the wavenumber region between 6046 and 6060 Cm-1. The maximum peak is located at 6055.17 Cm-1, which gives (8.58 ± 0.37) × 10-21 cm^2/molecule at the total pressure of ˜ 8.2 Torr of the N_2 buffer gas. By using the small step size of the laser wavenumber scan, we measured the pressure-broadening effects, and the pressure-shift effects, on CH_4 and CH_3D absorption lines. The N_2, O_2 and CO_2 pressure broadening coefficients of CH_3D are 0.058, 0.054 and 0.049 Cm-1/atm, respectively, at the wavenumber we employed. Under the experimental conditions we used, N_2 and O_2 have very similar pressure broadening effects, and their effects on CH_3D is very similar to those of CH_4. At the wavenumber we employed, the same values of N_2 and O_2 pressure-shift coefficient , - 0.012 Cm-1/atm, and a little higher value of CO_2, - 0.013 Cm-1/atm, were found.

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