Observation and Identification of Metastable Excited States in Ultrafast Laser-Ionized Pyridine |
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Authors: | David B Foote Timothy D Scarborough Cornelis J G J Uiterwaal |
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Institution: | (1) Department of Physics and Astronomy, University of Nebraska-Lincoln, Lincoln, NE 68588-0299, USA |
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Abstract: | We report on the fragmentation of ionized pyridine (C5H5N) molecules by focused 50 fs, 800 nm laser pulses. Such ionization produces several metastable ionic states that fragment
within the field-free drift region of a reflectron-type time of flight mass spectrometer, with one particular metastable dissociation
being the leading fragmentation process. Because the time of flight is no longer dependent in a simple way on the mass of
the ion, the metastable decay is manifested as an unfocused peak on the mass spectrum that appears at a time of flight not
corresponding to an integer mass. A previously-developed method is used to identify the precursor and final masses of these
ions. The metastable process that creates the most prevalent peak is shown to be C5H5N+ → C4H4+ + HCN. Simulations confirm this result and place restrictions on the processes for several other observed metastable reactions. |
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