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. Author manuscript; available in PMC: 2010 Jun 1.
Published in final edited form as: Anal Chem. 2009 Jun 1;81(11):4174–4182. doi: 10.1021/ac8013675

Figure 1.

Figure 1

Versatility of VUV SPI-MS as a soft ionization technique. (a) IEs of some organic compounds as a function of the molecular weight (homologous series), as well as the photon energy distribution of some lamp- and laser-based VUV light sources. (Adapted with permission from Ref. 18.) (b) Mass spectra of diesel fuel, recorded by SPI (top; EBEL-Ar lamp emitting 9.8-eV photons; the red stars indicate n-alkanes) and EI ionization (bottom; 70-eV kinetic energy). The homologous series of the alkanes in the SPI-MS is marked by red stars. The spectra are recorded by GC/SPI-EI-MS. All mass spectra of the respective runs have been added. (Adapted with permission from Ref. 5.)