PDS: The Planetary Atmospheres NodeEarth: molecular spectral regions
CO2 15 µm spectral region
2 (667.381 bending mode) vibrational-rotational band1 (1388.23 symmetric stretch mode) fermi-resonance
stimulated by 2 (618.029, 720.805)B(CO2) = 0.39 cm-1
Q-branch at 667.5 (2 mb)
line wings have 1.5 scale height wide weighting functions
line centers have 2.5 scale height weighting functions
| band cm-1 | S at 180 K cm-2 amagat | A0 cm-1 |  0atm-1 cm-1 | d cm-1 |
| 667 | 549 | 17.3 | 0.097(300/T)(2/3) | 1.56 |
| 2350 | 4505 | 15.4 | 0.097(300/T)(2/3) | ?? |
| 3715 | 102 | 32.2 | 0.097(300/T)(2/3) | ?? |
| band cm-1 | transition123 | S at 300 K cm-2 amagat | Ej cm-1 | d cm-1 |
| 667.381 | 0000 --> 0110 | 194 | 0.0 | 1.56 |
| 667.751 | 0110 --> 0220 | 15 | 667.381 | 0.78 |
| 720.805 | (I) 0110 --> 1000 | 5.00 | 667.381 | 1.56 |
| 618.029 | (II) 0110 --> 1000 | 4.27 | 667.381 | 1.56 |
| 668.107 | 0220 --> 0330 | 0.85 | 1335.131 | 0.78 |
| 647.063 | (II) 1000 --> 1110 | 0.7 | 1285.410 | 1.56 |
| 668.670 | (I) 1000 --> 1110 | 0.3 | 1388.185 | 1.56 |
NOTE: for C12O16O17 and C12O16O18 the mean line spacing is 0.78 for all bands
0 = 0.067 (300/T)(2/3) atm-1 cm-1
S(T0) · (T0/T)
[ (1 - exp(-1.439 /T))3 ] / [(1 - exp(-1.439 /T0))3 ]
CO2 4.3 µm spectral region
3 (2349.16 asymmetric stretch mode) band, no Q-branch
high T dependence of high J lines makes narrower weighting functions free of
isotopes and hot lines
H2O 6.3 µm spectral region}
| band | H2O | HDO |
| 1 | 3657.05 | 2723.68 |
| 2 | 1594.75 | 1403.49 |
| 3 | 3755.93 | 3707.47 |
non-linear molecule with angle of 104.45°
1 ~ 3 ~ 2 · 2
O3 9.6 µm spectral region
1 1110 cm-1
2 1045 cm-1
3 701 cm-1
CH4 spectrum
of the 9 modes, only 1 through 4 are independent, and
3 and 4 are triply degenerate.
13C is 1.108 % of all Carbon
| band | 12CH4 | 13CH4 |
| 4 | 1310.76 | 1302.77 |
| 2 | 1533.37 | |
| 3 | 3018.92 | 3009.53 |
| 24 | 2612 | |
| 2 + 4 | 2830 | 2822 |
| 22 + 4 | 3062 | |
| 1 + 4 | 4223 | |
| 3 + 4 | 4340 | |
| 2 + 3 | 4540 |
| band cm-1 | S cm-2 amagat-1 | A0 cm-1 | 0 atm-1 cm-1 | d cm-1 |
| 1306 | 185 | 52(T/300)0.5 | 0.075(300/T)0.5 | 5.3 |
| 3020 | 320 | 124(T/300)0.5 | 0.075(300/T)0.5 | 10.5 |
| 4220 | 20 | 124(T/300)0.5 | 0.075(300/T)0.5 | 10.5 |
| 5861 | 3 | 124(T/300)0.5 | 0.075(300/T)0.5 | 10.5 |
