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II.C.2.

Electronic Spin Splitting Corrections

(subtract from ab initio heat of formation)

Correction energies
    correction
species name cm-1 hartree kJ mol-1
B Boron atom 10.2  0.000046 0.122
C Carbon atom 29.6  0.000135 0.354
C+ Carbon atom cation 42.3  0.000193 0.506
N+ Nitrogen atom cation 88.9  0.000405 1.063
O Oxygen atom 78.0  0.000355 0.933
F Fluorine atom 134.7  0.000614 1.611
F+ Fluorine atom cation 168.1  0.000766 2.011
Ne+ Neon atom cation 260.1  0.001185 3.112
Al Aluminum atom 74.7  0.000340 0.894
Si Silicon atom 149.8  0.000682 1.792
Si+ Silicon atom cation 191.5  0.000873 2.291
P+ Phosphorus atom cation 315.6  0.001438 3.775
S Sulfur atom 196.0  0.000893 2.345
Cl Chlorine atom 293.7  0.001338 3.513
Cl+ Chlorine atom cation 343.0  0.001563 4.103
Ar+ Argon atom cation 477.2  0.002174 5.709
Ti Titanium atom 222.5  0.001014 2.662
Ga Gallium atom 550.8  0.002510 6.589
Ge Germanium atom 969.0  0.004415 11.592
Se Selenium atom 944.8  0.004305 11.302
Br Bromine atom 1228.4  0.005597 14.695
Br+ Bromine atom cation 1471.9  0.006706 17.607
I Iodine atom 2534.4  0.011548 30.318
CH Methylidyne 14.0  0.000064 0.167
OH Hydroxyl radical 69.6  0.000317 0.833
DO Hydroxyl-d 69.6  0.000317 0.833
LiO lithium oxide 56.0  0.000255 0.670
NO Nitric oxide 59.9  0.000273 0.717
CF Fluoromethylidyne 38.6  0.000176 0.461
FO Oxygen monofluoride 98.1  0.000447 1.173
NaO sodium monoxide 53.6  0.000244 0.641
SiH Silylidyne 71.4  0.000325 0.854
SiF silicon monofluoride 80.9  0.000369 0.968
PO Phosphorus monoxide 112.0  0.000510 1.340
SH Mercapto radical 188.5  0.000859 2.255
DS Mercapto-d 188.4  0.000858 2.253
NS Mononitrogen monosulfide 110.8  0.000505 1.325
SF Monosulfur monofluoride 200.5  0.000914 2.399
PS phosphorus sulfide 160.4  0.000731 1.919
CCl carbon monochloride 67.5  0.000307 0.807
ClO Monochlorine monoxide 159.0  0.000724 1.902
SiCl Clorosilylidyne 103.3  0.000471 1.236
SCl sulfur monochloride 200.0  0.000911 2.393
CuO Copper Monoxide 139.5  0.000636 1.669
BrO Bromine monoxide 408.0  0.001859 4.881
BO2 Boron dioxide 75.1  0.000342 0.898

These corrections are obtained from the atomic energy levels (MOORE) and the spin-orbit splittings from Herzberg. They are a weighted average of the splittings of the lowest energy state.
For example Carbon atom has a 3P ground state with the following splittings:
J Energy (cm-1) degeneracyEnergy * degeneracy
00.010.0
116.4349.2
243.55217.5
Total9266.7
The degeneracy of each J level is 2*J+1. The weighted average is then 266.7 / 9 = 29.63 cm-1


References

Huber, K.P.; Herzberg, G., Molecular Spectra and Molecular Structure. IV. Constants of Diatomic Molecules,, Van Nostrand Reinhold Co., 1979
Moore, C.E.,Atomic Energy Levels,NBS467, 1949.