Generation and Identification of Four Stable Isomeric + Ions by Direct Dissociative Ionization or by Charge Reversal of Anions

Article abstract of DOI:10.1021/ja00315a009

Examination of collisional activation mass spectra showed that pure ⁺ was generated by only metastably fragmenting precursor ions, ^+., ^+., and ^+..Pure +> could be produced from the dissociative ionization of in the ion source and among metastably fragmenting ions.The ions +> and +> were generated by collisionally induced charge inversion of the corresponding anions.The latter were produced by dissociative electron capture and by reaction of OH^- with cyclopropene and CH3CCD, respectively.Although +> exists in a potential well, +> ions produced by the above method lie close to their dissociation limit. +> and +> ions generated by charge reversal rearrange to similar mixtures of ⁺ and +> within a time of ca. 8 μs.The fragmentations ⁺ -> ⁺ + H2 and ⁺ -> ⁺ + C2H2 produce composite metastable peaks.The high and low kinetic energy release components therein were shown to result from the generation of ⁺ and +>, respectively.