Photoemission from Pyrene and its Derivatives

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Abstract
Photoemissions from pyrene and its derivatives, 1,3,6,8-tetrachloropyrene(TClP), 1,3,6,8-tetrabromopyrene(TBrP), 1,6-dicyanopyrene(CDNP), 1,3,6,8-tetracyanopyrene(TCNP), and 1,3,6,8-tetranitropyrene (TNO2P), were measured. Their photoelectron energy distribution curves(EDCs) were thus obtained; the peaks or shoulder appearing on the EDCs correspond to the ionization potentials of the pyrene molecule. Further, the spectral dependences of their quantum yields(SDQYs) were measured. The ionization potentials obtained from their threshold values were 5.8 eV(pyrene), 6.3 eV(TClP), 6.0 eV (TBrP), 6.3 eV(DCNP), 6.2 eV(TCNP), and 6.6 eV(TNO2P).