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Previous studies have shown that the solitary ketene–water ion CH 2 C(O)OH 2+ (1) does not isomerize into CH 2 C(OH) 2+ (2), its more stable hydrogen shift isomer. Tandem mass spectrometry based collision experiments reveal that this isomerization does take place in the CH 2 O loss from low-energy 1,3-dihydroxyacetone ions (HOCH 2 ) 2 ...
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