2013 年 2 巻 1 号 p. A0020
Collision-induced dissociation (CID) experiments of adducts [M+R]− with negative atmospheric ions R− (O2−, HCO3− and COO−(COOH)) produced in NO3−-free discharge area in atmospheric pressure corona discharge ionization (APCDI) method were performed using aliphatic and aromatic compounds M. The [M+R]− adducts for individual R− fragmented to form deprotonated analytes [M−H]− as well as the specific product ions which also occurred in the CID of [M−H]−, independent of analytes with several different functional groups. The results obtained suggested that the specific product ions formed in the CID of [M+R]−, as well as CID of [M−H]−, are generated due to further fragmentation of the product ions [M−H]−. It was concluded, therefore, that CID of [M+R]− formed in NO3−-free discharge area can indirectly lead to the formation of the product ions originating from [M−H]−.