Abstract
The line intensity and self-broadening coefficient of the 619.68 nm overtone absorption line of methane are measured at room temperature using intracavity laser spectroscopy (ILS). The methodology appropriate for quantitative analysis of absorption lineshapes with ILS is determined by data recorded for several absorption lines of the well-studied oxygen γ-band. The values for methane line intensity ( S=0.119±0.009 cm −1 atm −1 km −1) and self-broadening coefficient (γ c=0.090±0.007 cm −1 atm −1) found in this study are in agreement with previously published values obtained with other experimental techniques.
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