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A spurious [CH 5 ] − ion: Problems with negative chemical ionization quadrupole instrument
Author(s) -
Poppe A.,
Schröder E.,
Budzikiewicz H.
Publication year - 1986
Publication title -
organic mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.475
H-Index - 121
eISSN - 1096-9888
pISSN - 0030-493X
DOI - 10.1002/oms.1210210203
Subject(s) - dynode , ion , electron multiplier , chemical ionization , ionization , analyser , ion source , quadrupole mass analyzer , mass spectrometry , electron ionization , atmospheric pressure laser ionization , analytical chemistry (journal) , atomic physics , chemistry , secondary electrons , physics , electron , nuclear physics , electrode , chromatography , organic chemistry , anode
It is shown that in a quadrupole mass spectrometer set up for negative chemical ionization, positive ions can be formed between the ionization chamber and the analyser both by electron impact and by chemical ionization. These ions will be registered together with negative ions formed in the ion source if the instrument is equipped with a positive and a negative conversion dynode and may reach the secondary electron multiplier even if the negative conversion dynode is disconnected.