Photodissociation of Gaseous Ions Formed by Laser Desorption.
Technical rept. 1 Jun 85-1 Jul 86,
FLORIDA UNIV GAINESVILLE DEPT OF CHEMISTRY
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Both pulsed and gated continuous wave carbon dioxide lasers have been employed to desorb ions and then to photodissociate them in a Fourier transform ion cyclotron resonance mass spectrometer. Pulsed CO2 laser irradation was most successful in laser desorption experiments, while a gated continuous wave laser was used for a majority of the successful infrared multiphoton dissociation studies. Fragmentation of ions with mz values in the range 400-1300 was induced by infrared multiphoton dissocation. Such photodissociation was successfully coupled with laser desorption for a number of different classes of compounds. Either two sequential pulses from a pulsed carbon dioxide laser one for desorption and one for dissociation or one desorption pulse followed by gated continuous wave irradation to bring about dissociation were ultilized. Keywords Carbon Dioxide Lasers Fourier Transform Ion Cyclotron Resonance Mass Spectrometry Infrared Multiphoton Dissociation Laser Desorption.
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