NH 3 and PH 3 line parameters: the 2000 HITRAN update and new results

Abstract

This paper describes the improvements incorporated into the 2000 version of the HITRAN database for ammonia (NH 3), as well as newer results for phosphine (PH 3) not included in HITRAN 2000. For ammonia, the HITRAN 2000 database contains some 29 084 ammonia lines, more than double the number of lines in HITRAN 1996. Specifically, the 2000 update involved replacing pure-rotational and infrared transitions from 0 to 3700 cm −1 with new calculations for the 14 NH 3 isotopomer, whereas in the 4000 to 5300 cm −1 region, parameters from the 1996 database were retained. The rotational quantum number range for line positions, intensities and line broadening parameters updated in this new HITRAN version goes up to J=22, 15, 13 and 10 in the 8– 1000 μm , 5 μm , 4 μm and 2.8– 3.3 μm spectral regions respectively. For phosphine, a new database from 770 to 2156 cm −1 available for future updates is described and contrasted with parameters in HITRAN 2000.