ECTDL study of N 2 - and O 2 -pressure broadening of a series of ammonia lines in the 1.5 μm (ν 1 +ν 3 ) combination band

Abstract

Nitrogen and oxygen pressure broadening parameters for seven rP(J”,0) transitions of the ν1+ν3 overtone band of the main isotope of ammonia with J” varied from 2 to 9 have been measured at room temperature using an external cavity tunable diode laser spectrometer. Air-broadening parameters have also been calculated from the N2 and O2 measurements. The results are compared to previous measurements in the ν1, ν2, ν3, ν4 and ν1+ν3 bands and to the parameters for the ν3 band that are reported in the HITRAN database.