Electron Microscopy NewsOur latest blogs on (Scanning) Electron Microscopes, NMR & Mass Spectometryhttps://www.jeolbenelux.com/JEOL-BV-NewsJEOL (Europe) BV introduces: Photo Ion-Source for JMS-T200GC AccuTOF GCxhttps://www.jeolbenelux.com/JEOL-BV-News/PostId/29/jeol-europe-bv-introduces-photo-ion-source-for-jms-t200gc-accutof-gcxGeneralFri, 19 Feb 2016 11:27:19 GMT<p style="margin-bottom: 0.0001pt;"><span style="font-size: 13px;">Electron ionization (EI), generally used for GC/MS and GCxGC/MS analysis, produces fragment ions. Fragments are valuable for database search and compound identification. </span><span style="font-size: small;">However, fragmentation adds an additional level of complexity in interpreting complex mixtures, such as crude oil. Some compounds (e.g. alkanes, alcohols) do not produce abundant (or any) molecular ions.</span></p> <p style="margin-bottom: 0.0001pt;"><span style="font-size: small;"></span></p> <p><span style="font-size: 13px;">Since photoionization (PI) is a softer ionization method than EI, molecular ion can be easily distinguished using this technique. For some analytes, characteristic fragment ions may also be observed. </span><span style="font-size: small;">Combining soft ionization with high-resolution exa</span><span style="font-size: small;">ct-mass data and new software tools simplifies processing of complex GC and GCxGC data (e.g. petroleum type analysis).</span></p> <p style="margin-bottom: 0.0001pt;"><span style="font-size: 13px;">PI provides clear molecular ions and elemental composition that can be combined with EI data to identify unknowns and also provides selective ionization of target compounds</span></p> <p style="margin-bottom: 0.0001pt;"><span style="font-size: 13px;"></span></p> <p style="margin-bottom: 0.0001pt;"><span style="font-size: small;">The JEOL PI source is designed as a PI/EI combination ion source. Switching between PI and EI can be done without breaking vacuum of the ion source, even without breaking any vacuum. Also during an analytical run it is possible to switch between PI/EI and vice versa. The accurate mass will always stay available whatever ionisation technique is used with our JMS-T200GC AccuTOF GCx.</span></p> <p style="margin-bottom: 0.0001pt;"><span style="font-size: small;"></span></p> <p><span style="font-size: small; text-align: center;">At this moment a PI source is available for our GC-TOF and GC-Quadrupole systems.</span></p> <p style="text-align: center;"><img alt="JEOL Photo Ion-Source" src="https://www.jeolbenelux.com/Portals/0/PI%20T200.jpg" style="font-size: small; text-align: center; width: 350px; height: 296px;" /></p> 29