Spectra and Additional Sources of S-MIF

The approximate SO2 isotopologue spectra constructed here can be improved in several ways. First, less prominent vibrational mode progressions should be in- 

Some recent meteorite and geochemical measurements [38,39] show evidence for non-zero MIF in but very small or negligible MIF in i.e., A S  

MIF signatures of this type might fortuitously arise during SO2 photodissociation for very high SO2 abundance ( 100 ppb), but more likely are the result of hyperfine effects associated with the non-zero nuclear spin of A photochemical hyperfine effect may occur, analogous to spin-forbidden CO2 photolysis [40], at near-ultraviolet wavelengths. 

The S02 product in reaction (R4) would be highly enriched in which would be passed to SO3 and/or SO. 

Chemical, as opposed to photolytic, sources of S-MIF are also possible in the Archean atmosphere. By analogy with oxygen MIF produced during O3 formation [2], which is attributed to a symmetry-dependent non-statistical redistribution of internal energy in the vibrationally excited O3 [7], it is likely that reactions such 

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