Chlorophyll-a is ionized by laser desorption in a field-free, grounded ion source of a time-of-flight mass spectrometer. The use of a time delay between the ionizing laser pulse and the ion drawout pulse permits metastable decompositions to occur prior to mass analysis. The fragmentation pattern observed in the resultant mass spectra varies with the magnitude of the time delay and is consistent with multistep fragmentation processes for which the rate constants are of the order of 105-106 s-1. Two derivatives are also examined, for which metastable decomposition is not observed.
|Number of pages
|International Journal of Mass Spectrometry and Ion Processes
|Published - May 10 1985
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