Self-broadening and self-shift in the [formula omitted] band of ammonia from mid-infrared-frequency-comb spectroscopy

Abstract

We report the broadband absorption spectrum of the 3ν2 band of 14NH3 near 4 μm. The data were recorded using a mid-infrared frequency comb coupled to a homebuilt Fourier-transform spectrometer with a resolution of 0.00501 cm−1. Line positions, line intensities, self-broadening, and self-shift parameters for six rovibrational lines were determined at room temperature (T=296 K). Comparison with HITRAN 2016 shows good agreement at improved precision. The high precision and the rapid tunability of our experiment enables advanced fast spectroscopy of molecular gases.