Spectroscopic line parameters of helium- and hydrogen-broadened 12c16o transitions in the 3–0 band from 6270 cm−1to 6402 cm−1.
Reed, Zachary
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https://hdl.handle.net/2142/91494
Description
Title
Spectroscopic line parameters of helium- and hydrogen-broadened 12c16o transitions in the 3–0 band from 6270 cm−1to 6402 cm−1.
Author(s)
Reed, Zachary
Contributor(s)
Hodges, Joseph T.
Issue Date
2016-06-22
Keyword(s)
Small molecules
Abstract
We present helium- and hydrogen-broadened linewidths, pressure-induced shifts, and collisional narrowing coefficients for selected lines in the P- and R- branch of the second overtone (3–0) band of CO, spanning from 6270 \wn to 6402 \wn. The contribution of speed dependent effects and partial correlation between velocity-changing and dephasing collisions on the foreign broadened line shapes are also discussed. The data were obtained using the frequency-stabilized cavity ringdown spectroscopy technique. Spectra were collected at room temperature over a pressure range from 13.3 kPa to 100 kPa. The spectrum frequency axis is referenced via an optical frequency comb to a Cs clock, which provides pressure shifting values with uncertainties as low as 100 kHz/atm. The spectra exhibited signal-to-noise ratios as high as 20,000:1, which enables rigorous tests of theoretical line profiles through multi-spectrum least squares data analysis. The partially correlated, quadratic-speed-dependent Nelkin Ghatak profile gives a quality of fit mostly commensurate with the high spectrum signal-to-noise and minimizes structural residuals.
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