Abstract

Line strengths and broadening coefficients for formaldehyde (H₂CO) near 3.5 μm were measured at room temperature using a tunable IR diode laser. Because of the extremely narrow linewidth of the laser (≈10⁻³ cm⁻¹), the transitions were recorded at a resolution limited only by collision and Doppler broadening. The spectral parameters were determined from Voigt line shape fits to R and Q branch rotational–vibrational transitions of the ν₅ band between 2867 and 2881 cm⁻¹. Line strength measurements were made on both pure and dilute samples H₂CO. Pressure broadening of H₂CO lines by N₂ was measured in mixtures containing of 0.8–1.2% H₂CO.

© 1988 Optical Society of America

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