Line Broadening and the Temperature Exponent of the Fundamental Band in CO–N2 Mixtures

Temperature dependence of self- and N2-broadeningand pressure-induced shifts in the 3←0 band of CO

“…Lastly, we have retrieved the weak line mixing coefficients. Their size and pattern with m are similar with observations for the lower vibrational bands [14,16,17].…”

“…17, we plot our room temperature results for CO and CO -N 2 . The observed antisymmetry with rotational quantum number is consistent with measurements of line mixing coefficients in the 1ˆ0 [16] and 2ˆ0 bands [14,17]. The mixing coefficients in the R-or P-branches pass through zero near the center of gravity of the branch.…”

Line Broadening and Shifting Studies of the J=5←4 Transition of Carbon Monoxide Perturbed by CO, N2, and O2

“…Our results from the pressure-broadening investigation may be compared with broadening coefficients at room temperature reported from IR studies on the R(4) (m = 5) line of the fundamental vibrational band (13)(14)(15)(16)(17)(18)(19), which involves the same lower (J = 4) and upper (J = 5) rotational state as for the line reported here. As shown in Table 3, the results from the two spectroscopic ranges are in fair agreement for self-broadening, and very consistent for foreign gas broadening with N 2 and O 2 .…”

“…A few papers on lineshape investigations were concerned with the study of the R(4) (m = 5) line in the fundamental vibrational band of CO (13)(14)(15)(16)(17)(18)(19). In this paper we report on the results of an experimental investigation of the collisional relaxation of the J = 5 ← 4 rotational line of CO induced by carbon monoxide, nitrogen, and oxygen.…”

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

“…For this line the fitted β 0 value is close to β 0 diff and to the β 0 soft value determined at low pressure if the power q of the intermolecular potential (r −q ) is chosen equal to 5.5. In the same way, as Predoi-Cross et al (26) did for CO-N 2 mixtures, we can fix the β 0 value at the β 0 diff value and use the (obs-calc) residuals to determine the best choice of q. Figure 10 reproduces the observed H 2 O line at 2087 cm −1 perturbed by nitrogen at 100 Torr, deviations of about 0.5% occur when it is compared with a synthetic line using a Voigt profile.…”