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001038812 1001_ $$00000-0001-5014-6858$$aNakayama, Yasuo$$b0$$eCorresponding author
001038812 245__ $$aAnisotropic dispersion of excitonic bands of the single-crystal pentacene (001) surface as measured by low-energy angle-resolved high-resolution electron energy-loss spectroscopy
001038812 260__ $$aNew York, NY [u.a.]$$bElsevier$$c2025
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001038812 520__ $$aLow-energy high-resolution electron energy-loss spectroscopy (HREELS) is a useful technique for the charac-terization of various excitation processes at solid surfaces. However, no successful work has been reported onmolecular single-crystal samples yet. In the present study, low-energy angle-resolved HREELS measurementswere conducted on single-crystal pentacene, an organic semiconductor. The results confirmed the excitonicbands exhibiting energy–momentum dispersion and anisotropy of these depending on the surface crystallo-graphic directions, corroborating the occurrence of exciton delocalization, contrary to the ordinary notion of theFrenkel exciton for weakly interacting van der Waals molecular solids. The present results demonstrate that low-energy angle-resolved HREELS is applicable to the precise examination of the excitonic characteristics of solid-state surfaces, even for molecular semiconductor single crystals.
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001038812 536__ $$0G:(GEPRIS)385975694$$aSFB 1083 A12 - Struktur und Anregungen von hetero-epitaktischen Schichtsystemen aus schwach wechselwirkenden 2D-Materialien und molekularen Schichten (A12) (385975694)$$c385975694$$x2
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001038812 7001_ $$0P:(DE-Juel1)167128$$aBocquet, François C.$$b1
001038812 7001_ $$0P:(DE-HGF)0$$aTsuruta, Ryohei$$b2
001038812 7001_ $$0P:(DE-Juel1)128790$$aSoubatch, Serguei$$b3
001038812 7001_ $$0P:(DE-Juel1)128791$$aTautz, F. Stefan$$b4$$eLast author
001038812 773__ $$0PERI:(DE-600)1491139-5$$a10.1016/j.elspec.2025.147514$$gVol. 279, p. 147514 -$$p147514$$tJournal of electron spectroscopy and related phenomena$$v279$$x0368-2048$$y2025
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