Abstract
The multiphoton ionization of fluoranthene in liquid tetramethylsilane in the laser excitation wavelength λl range 370–550 nm is reported. From measurements of the laser wavelength and power dependencies of the ionization signal the ionization threshold was determined to be ∼5.7 eV. Two ionization mechanisms were identified in this wavelength region: (1) direct two-photon ionization for λl ≲435 nm and (2) three-photon ionization—involving two-photon excitation followed by relaxation to either the first and/or the second excited singlet state and subsequent one-photon ionization—which becomes the sole photoionization mechanism for λl ≳435 nm. In the wavelength region 400≤λl ≤435 nm both mechanisms occur.
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