Mass displacements in ion trap mass spectrometry: Can they be related to electronic properties of the substituent groups of the ions under investigation?

✍ Scribed by P. Traldi; S. Catinella; O. Bortolini

• Publisher: John Wiley and Sons
• Year: 1992
• Tongue: English
• Weight: 131 KB
• Volume: 27
• Category: Article
• ISSN: 1076-5174
• DOI: 10.1002/oms.1210270816

✦ Synopsis

OMS Letters

Dear

Sir Mass Displacements in Ion Trap Mass Spectrometry: Can They be Related to Electronic Properties of the Substituent Groups of the Ions Under Investigation? During experimental investigation of the mass displacements (AM) often encountered in ion trap' experiments, we faced, what was at first sight a surprising phenomenon, of different AM values for isobaric ions of different structures.2 The observed AM values, in the range 0.05-0.40 Da, were not related to differences in exact masses.

This behaviour could in principle be ascribed to spacecharge effects,, due to the interaction of the trapped ion cloud with the radiofrequency (rf) fields (drive and supplementary). The observation of the same phenomenon, however, for molecular species leading to the same total ion current and placed in the point q, = 0.85, a, = 0 of the stability diagram (so that all fragment ions, are ejected from the trap) proves that the observed mass displacements do not derive from any space-charge effect.