Mass Spectrometry Facility
images of Mass Spectrometry

Mass Spectrometry Examples

EI

The choice of ionization method depends on the properties of the sample.

GC-MS: Gas Chromatography/Mass Spectrometry

GC-MS with EI ionization, chromatogram (top) and spectrum of the first component (bottom).

Sample mixture injected into the GC is separated into components. Spectra are acquired about once per second. Electron Impact ionization produces molecular ions and/or fragment ions.

GCMS

EI


EI-DIP: Direct Insertion Probe Sampling

Sample introduction by Direct Insertion Probe (DIP), with EI ionization; evaporation profile (top) and spectrum (bottom). Sample is volatilized from a heatable probe directly into the mass spectrometer. Spectra are acquired about once per second.

DIP

DIP MS