| Budget Amount *help |
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2014: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2013: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
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| Outline of Final Research Achievements |
Two-photon photoemission (2PPE) from rubrene films on graphite (HOPG) has been measured with a photoelectron emission microscope (PEEM) as functions of pump photon energy and coverage. The image potential state mediated excitation (J. Phys. Chem. C 2012, 116, 5821) is found to occur at specific areas (denoted as resonance areas) surrounded with areas of the uniform film of one monolayer (ML) coverage. The brightness of the resonance areas for sub-ML coverage shows clear resonance enhancement peaking at the pump photon energies of 4.4 eV. The area vanishes at coverage higher than 1 ML. The intensity profiles show that the resonance area is composed of bare graphite and nm-size clusters or isolated rubrene molecules. The specific area dominates the 2PPE process, exemplifying the significant role of defective areas in photoexcitation processes.
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