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Results for lifetime calculations for 
1A2 states. (A and B) Decay of singlet populations for several sulfur isotopologues from the (010) and (100) vibrational states, which have rates faster than those of the (000) and (001) states (Table S4). (C and D) Isotope fractionation factor estimated from the lifetime of 
1A2 state calculated for the four low-lying vibrational levels: 
and 
where xk are rate constants for xSO2.
