title: Collision-Induced Dissociation Study of the Adduct Ions Produced in NO3 (-)-Free Area of Atmospheric Pressure Negative Corona Discharges under Ambient Air Conditions.
abstract: 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](-).
authors.affiliation: Graduate School of Nanobioscience, Yokohama City University.
authors.forename: Kanako
authors.initials: K
authors.lastname: Sekimoto
authors.affiliation: Graduate School of Nanobioscience, Yokohama City University.
authors.forename: Natsuki
authors.initials: N
authors.lastname: Matsuda
authors.affiliation: Graduate School of Nanobioscience, Yokohama City University.
authors.forename: Mitsuo
authors.initials: M
authors.lastname: Takayama
keywords: NO3−-free area; atmospheric ion adduct; atmospheric pressure corona discharge ionization (APCDI); collision-induced dissociation; negative atmospheric ion