Measurements of NH3 linestrengths and collisional broadening coefficients in N2, O2, CO2, and H2O near 1103.46 cm−1

► Laser absorption spectroscopy with a tunable quantum cascade laser was utilized. ► Six ammonia transitions in the ν2 sR(6,K) manifold near 1103.46 cm−1 were studied. ► Linestrengths were measured and found to be in agreement with HITRAN. ► NH3 Voigt and Galatry widths broadened by N2, O2, CO2, and H2O were measured. ► Reported linestrengths and widths may aid the development of ammonia sensors.