Multiphoton Ionization of Laser-Desorbed Neutral Molecules in a Fourier Transform Ion Cyclotron Resonance Mass Spectrometer

Abstract

Resonant multiphoton Ionization of laser-desorbed nonvolatile samples has been achieved in a Fourier transform ion cyclotron resonance (FTICR) mass spectrometer. The detection of Iron at the 100 ppm (parts per million) doping level in an InP compound semiconductor sample and the production of molecular Ions for a hexapeptide have been observed in a modified FTICR analyzer cell. A unique three-laser experiment has been devised In which infrared multiphoton dissociation of dipeptide ions, formed by resonant multiphoton ionization of laser-desorbed neutrals, is performed. © 1991, American Chemical Society. All rights reserved.