Abstract
We have measured the nitrogen-collision-induced line broadening and line shift coefficients of three singlet lines – P(1), R(0) and R(1) – belonging to the ν3 band of methane (12CH4) at 3.29–3.32μm using direct laser absorption spectroscopy by means of a continuous-wave mid-IR optical parametric oscillator. Owing to the well-isolated features of the singlet lines, the lineshapes were modeled with a simple Voigt profile in order to retrieve the line parameter coefficients. The values of the N2-broadening and pressure-shift coefficients agree fairly well with the previously published ones that use either Fourier-transform or mid-infrared difference-frequency spectrometers along with more complex analytic spectroscopic models.
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