Laser Desorption and Laser Post-Ionization Time of Flight Mass Spectrometry
Laser desorption with either multiphoton or single photon post-ionization is combined with time of flight mass spectrometric detection. In the first step large molecules are desorbed intact from a surface. In the second step laser ionization is employed to produce the ions of interest. Soft ionization, which yields primarily the molecular ion, and hard ionization, which yields primarily fragment ions, are both demonstrated.
Instrumental details are shown with results from recent laser desorption multiphoton and single photon ionization experiments on a perbenzoylated sugar and on two porphyrins.
KeywordsLaser Desorption Dominant Peak Multiphoton Ionization Flight Mass Spectrometer Benzoyl Group
Unable to display preview. Download preview PDF.