Shifting and line mixing parameters in the ν4 band of NH3 perturbed by CO2 and He: Experimental results and theoretical calculations

The HITRAN 2004 molecular spectroscopic database

“…[317,[319][320][321][322][323][324][325] (for He) and Refs. [321,326,327] (for CO 2 ). Even though the new parameters were constructed from a relatively large number of datareporting articles, the database would profit from future studies of NH 3 absorption lines perturbed by H 2 , He and CO 2 for validation purposes as described in Ref.…”

“…[128] for {(101),(030)}-(010) bands and those extrapolated from cold bands [141] were used. (213), (321) and (114) upper states. The coupled vibrational states { (213), (321), (114)} have been re-analyzed in Ref [143] with the FTS spectra recorded in Reims.…”

Fourier Transform Infrared Spectroscopy for the Measurement of Spectral Line Profiles

“…As expected this mutual lineattraction is negligible in the ν 2 band, for which the splitting is very large compared to that of the ν 3 and ν 4 bands. The self-shift coefficients of ammonia are larger than those obtained for other perturbers like He, H 2 and CO 2 (Hadded et al, 2001, Dhib et al, 2006 since the collisions in NH 3 are long range dipole-dipole collisions while the foreign gases collisions are shorter range collisions.…”

Diode-laser measurements of O2, N2 and air-pressure broadening and shifting of NH3 in the 10μm spectral region

“…For NH 3 -N 2 , the calculation with Da = 0.002 Å 3 leads to overestimated calculated line shifts [15,16], thus we considered C 6 = 4er 6 . In this case, we used the following expression of S iso 1 [16] S iso…”

“…In a recent work [5,15,16] we measured line shifts in the m 4 band of NH 3 perturbed by He, Ar, H 2 , N 2 , and CO 2 .…”