Gas Chromatography Mass Spectrometry (GC-MS) - 2021 - 07 - 06 Gas Chromatography Mass Spectrometry (GC-MS) Since its first bench-top gas chromatograph mass spectrometer (GC-MS) was sold in 1979, Shimadzu has been a leader in design innovations, such as our front access ion source, high efficiency ion optics, 20,000 u/second scan speed, and