The shape of the far wings of N2 and O2 broadened CO2 lines have been investigated, at room temperature, in the 2140–2250-cm−1 spectral region, i.e., on the low wavenumber side of the lines of the most intense band (ν3 of 12C16O2). The experimental results have been compared with calculated values based on the AFGL 1982 compilation. From this comparison it appears that the wings of the lines on the low wavenumber side of the centers decay much more rapidly than do Lorentz lines, by about the same amount as has been previously shown for the high wavenumber side. However, an asymmetrical correcting line shape factor is needed to obtain good agreement between experimental and synthetic spectra for wavenumbers σ ≲ 2190 cm−1.
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Experimental results.
Calculated values from the optimized form factor determined in Ref. 4 [i.e., χ(σ) = χ+(|σ|)].
Calculated values from χ(σ) = χ−(|σ|).
Calculated values from the optimized asymmetrical factor given in Table IV.
Table VI
Optimized Asymmetrical χ(σ) Form Factor O2 Broadened at 296 K
χ = 1
χ = 3.341 exp [− 0.4021 |σ|]
χ = 0.155 exp [− 0.0179 |σ|]
χ = 0.238 exp [− 0.0266 |σ|]
χ = 0.146 exp [− 0.0196 |σ|]
σ < 0
σ > 0
χ = 1.8593 exp [− 0.03776 |σ|]
χ = 0.146 exp [− 0.0196 |σ|]
Tables (6)
Table I
Experimental and Synthetic Results for N2 Broadening at 296 K;
σ(cm−1)
Experimental Spectral
Synthetic spectra
range of da densities (amagat)
range of db densities (amagat)
Symmetrical form factor χ(σ) ≡ χ+ (|σ|)
Asymmetrical opitimized form factor (cf. Table IV)
δ %
δ %
2246.3
0 – 0.1
0 – 0.5
1.66 10−2
1.66 10−2
0.
1.66 10−2
0.
2236.3
0 – 0.1
0 – 0.75
4.58 10−3
4.2 10−-3
8.3
4.2 10−3
8.3
2225.84
0 – 0.15
0 – 1
1.44 10−3
1.41 10−3
2.
1.41 10−3
2.
2210.28
0.1 – 0.2
0 – 1
1.5 10−4
1.59 10−4
−6.
1.36 10−4
9.
2201.28
0.25 – 0.5
0 – 1.25
5.12 10−5
4.86 10−5
5.
4.55 10−5
11.
2194.28
0.5 – 1
0 – 1.5
2.57 10−5
3.17 10−5
−23.
2.83 10−5
−10.
2178.03
0.8 – 1.3
0 – 2.5
1.11 10−5
1.69 10−5
−52.
1.28 10−5
−15.
2160.18
1 – 1.5
0 – 3
6.4 10−6
9.0 10−6
−40.
5.4 10−6
16.
Table II
Experimental and Synthetic Results for O2 Broadening at 296 K
Experimental results.
Calculated values from the optimized form factor determined in Ref. 4 [i.e., χ(σ) = χ+(|σ|)].
Calculated values from χ(σ) = χ−(|σ|).
Calculated values from the optimized asymmetrical factor given in Table IV.
Table VI
Optimized Asymmetrical χ(σ) Form Factor O2 Broadened at 296 K