Previous attempts to develop soft electron ionization have been compromised by a dramatic drop in sensitivity, and other approaches are limited by the inconvenience of reagent gases or source exchange. Markes International’s has launched a variable-energy electron ionization source technology for GC-MS, Select-eV. Available with the BenchTOF range of time-of-flight mass spectrometers, it allows for the production of reference-quality electron ionization mass spectra with conventional full-fragmentation patterns, and repeatable soft-ionization spectra exhibiting reduced fragmentation and an enhanced molecular ion. It overcomes previous limitations by maintaining or enhancing sensitivity without the need to reconfigure the system or add reagents. Markes International Ltd.
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