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Formation of protonated phosphonates in the ion‐trap mass spectrometer under electron impact conditions
Author(s) -
Méchin N.,
Plomley J.,
March R. E.,
Blasco T.,
Tabet J.C.
Publication year - 1995
Publication title -
rapid communications in mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.528
H-Index - 136
eISSN - 1097-0231
pISSN - 0951-4198
DOI - 10.1002/rcm.1290090103
Subject(s) - chemistry , electron ionization , ion , protonation , chemical ionization , ion trap , mass spectrometry , quadrupole ion trap , isomerization , molecule , mass spectrum , ionization , adduct , quadrupole mass analyzer , ion source , polyatomic ion , enol , photochemistry , organic chemistry , chromatography , catalysis
Abstract The gas‐phase behaviour of organophosphorus compounds such as diethylmethylphosphonate towards electron impact (EI) ionization occurring in a quadrupole ion‐trap instrument is investigated. If all ions observed in conventional EI mass spectra are detected, ion/molecule reactions are seen to occur leading to formation of protonated molecules and adduct ions such as 2M +· and [2M + H] + . The keto‐to‐enol‐like isomerization of the molecular M +· ion seems to favour proton transfer to neutral M species and a “self chemical ionization” ion is observed with corresponding fragment ions.