Air- and N2-Broadening Parameters of Water Vapor: 604 to 2271 cm−1

Intercomparison of atmospheric water vapor soundings from the differential absorption lidar (DIAL) and the solar FTIR system on Mt. Zugspitze

“…This fact as well as the almost ideal slope s of the correlation line (s = 0.996, R = 0.99) indicate that the spectroscopic parameters used for the retrieval of both the DIAL and the FTIR instrument are highly consistent. Quantitative spectroscopy of the molecular line parameters was derived independently for FTIR by Toth et al (1998); Toth (1998Toth ( , 2000, and, for the DIAL by Ponsardin and Browell (1997), respectively. The agreement (Fig.…”

Narrowing and Broadening Parameters for H2O Lines in the ν2 Band Perturbed by Nitrogen from Fourier Transform and Tunable Diode Laser Spectroscopy

“…In the 13 558-13 966 cm −1 region Grossman and Browell (8) used the soft and hard collision models to describe their observed H 2 O line profiles perturbed by different buffer gases. In these studies (7,8), the narrowing parameters were determined with a large uncertainty and are not close to the dynamic friction coefficient deduced from the diffusion coefficient. The results obtained in the present work will be compared with the values of Ref.…”

Air-broadening parameters in the ν3 band of 14N16O2 using a multispectrum fitting technique

“…For the asymmetric molecules like water, polynomial expressions that reproduce all the measurements are not easily discerned because the widths vary not only as a function of m and K m , but also depend on the values of s = K a + K c À J and DJ [29][30][31]. In these prior papers, m is called J m and defined as J 00 for P-and Q-branch lines, and J 00 + 1 for R-branch lines; K m is the value of the maximum K a in the rotational quanta; for example, the transition 4 1 4 fi 3 2 1 would have m = 4 and K m = 2.…”

“…In Fig. 4, the P and R transitions are plotted with different symbols in order to see if the P branch line shifts are more negative than those of the R-branch lines, as seen in CO 2 [26], CO [27], and H 2 O [28][29][30]; however, there is no apparent difference for NO 2 .…”

“…Instead, we extended an exponential form given previously for N 2 O by Toth [29]. The measured halfwidth coefficients, b 0 L ðairÞ, were least-squares fitted to an empirical expression given by the following:…”