scholarly journals Measurement of Negative Ions Formed by Electron Impact. I. Negative Ion Mass Spectra of Nitroalkanes

1969 ◽  
Vol 42 (3) ◽  
pp. 607-614 ◽  
Author(s):  
Satoru Tsuda ◽  
Akira Yokohata ◽  
Michihiro Kawai
Keyword(s):  
Electron Impact ◽  
Mass Spectra ◽  
Negative Ions ◽  
Negative Ion

Electron impact studies. XCIII. The reactions of negative ions from 3- and 4-nitrophthalic anhydrides

1975 ◽  
Vol 28 (3) ◽  
pp. 563 ◽  
Author(s):  
JH Bowie ◽  
BD Williams
Keyword(s):  
Electron Impact ◽  
Phthalic Anhydride ◽  
Cyclotron Resonance ◽  
Mass Spectra ◽  
Negative Ions ◽  
Negative Ion ◽  
Ion Cyclotron Resonance ◽  
Impact Studies ◽  
Ion Molecule Reactions ◽  
Positive Ions

Possible structures for some rearrangement ions in the negative ion mass spectra of 3- and 4-nitro- phthalic anhydride are suggested from an examination of the + E spectra obtained by the conversion of the negative ions to positive ions by charge-stripping reactions. The reactivities of the non-decomposing negative ions have been investigated by observation of their ion-molecule reactions with the neutral anhydride in the cell of an ion cyclotron resonance spectrometer.

Comparison of Five Ionization Methods for Producing Mass Spectra of Typical Organophosphorus Pesticides

1978 ◽  
Vol 32 (4) ◽  
pp. 388-399 ◽  
Author(s):  
Kenneth L. Busch ◽  
Maurice M. Bursey ◽  
J. Ronald Hass ◽  
G. Wayne Sovocool
Keyword(s):  
Electron Impact ◽  
Mass Spectra ◽  
Chemical Ionization ◽  
Organophosphorus Pesticides ◽  
Large Fraction ◽  
Negative Ion ◽  
Oxygen Mixture ◽  
Ion Molecule Reactions ◽  
And Migration ◽  
Positive Chemical Ionization

Positive ion mass spectra obtained by conventional electron impact and by methane chemical ionization were compared with the negative ion mass spectra of 16 typical organophosphorus pesticides using methane, a methane-oxygen mixture, and oxygen as enhancement/reagent gases. In the negative ion spectra, phosphate and phenate anions typically carry a large fraction of the ion current. Displacement of chlorine by oxygen is noted in some cases, and migration of aryl groups from oxygen to sulfur is occasionally noted. Ion-molecule reactions between two species derived from sample molecules have been observed. The sensitivity of the negative ion techniques for the pesticides examined is greater than conventional electron impact or methane positive chemical ionization techniques, and can be up to 800 times more sensitive for some compounds.

Sign in / Sign up

Export Citation Format

Share Document