Foreign-gas pressure broadening and shift of ammonia transition lines in the ν 2 vibrational bands

Abstract

Foreign-gas broadening and shift have been measured for transitions in the ν 2, 2ν 2 and ν 4 bands of ammonia using a diode laser spectrophotometer. The measurements were performed by using foreign-gases such as CO 2, N 2, air, H 2, and He at room temperature. The pressure-broadening and shift coefficients may be useful in modelling planetary atmospheres and the recently developed infrared (i.r.) ammonia laser. The experimental results are compared with the Anderson-Tsao-Curnutte theory for broadening CO 2 and N 2, which have large quadrupole moments. The agreement is satisfactory on the average.