Absolute measurements of intensities, positions and self-broadening coefficients of R branch transitions in the ν2 band of ammonia

摘要

A complete spectroscopic study of 22 ammonia transitions belonging to the ν_2 fundamental band has been undertaken using a high-resolution Fourier transform spectrometer. More than 80 spectra of pure ammonia were recorded at different conditions of temperature (235, 264, and 296K) and pressure (160-2000Pa). Special attention was paid to the determination of the absolute wavenumber scale and of the ammonia partial pressure, which allowed to determine absolute positions (8×10~(-5)cm~(-1)), absolute intensities (<2%) and self-broadening coefficients (<2%) with high accuracy. Measured intensities show a mean difference of more than 13% compared to intensities extracted from the HITRAN (2008) database while absolute positions are in very good agreement (-3.3×10~(-5)cm~(-1)) with database values. Self-pressure shift coefficients are also reported.