The fragmentation processes of the aromatic conjugated diene systems have been studied by many research groups [1–10]. Derrick et al. , have studied the electronic structure using photoelectron spectroscopy, where a number of highly excited Rydberg states were accessed, also they attributed the fragmentation of the furan molecule to the photoelectron energy responsible for the breaking of the C–C bond or the C–O bond. Rockwood et al. , using a fixed frequency KrF laser (249 nm), and Zandee and Bernstein , using nitrogen laser pumped dye laser, both found extensive ion fragmentation as the laser power density was increased. Cooper et al.  studied the fragmentation process of the benzene, pyrrole, and furan molecules using the resonantly enhanced multiphoton ionization technique; they stated that the fragmentation process for benzene was efficient at the highest laser power density 5 × 109 W/cm2, for furan molecule at a laser wavelength of 376 nm, in a two–photon resonance the parent ion was seen as the strongest peak, while at 550.5 nm in a three–photon resonance the parent ion was not seen in full laser power, and only appeared slightly at 54% of the laser power. Boesl et al. , in a work done on the fragmentation of furan, reported a weak dependence of the ion efficiency on wavelength.
|Number of pages||4|
|Journal||Arabian journal for science and engineering|
|Publication status||Published - 1 Jan 2008|
- ENHANCED MULTIPHOTON IONIZATION
- MULTI-PHOTON IONIZATION