Electron-Vibration Coupling in Molecular Materials: Assignment of Vibronic Modes from Photoelectron Momentum Mapping.
Electron-phonon coupling is one of the most fundamental effects in condensed matter physics. We here demonstrate that photoelectron momentum mapping can reveal and visualize the coupling between specific vibrational modes and electronic excitations. When imaging molecular orbitals with high energy resolution, the intensity patterns of photoelectrons of the vibronic sidebands of molecular states show characteristic changes due to the distortion of the molecular frame in the vibronically excited state. By comparison to simulations, an assignment of specific vibronic modes is possible, thus providing unique information on the coupling between electronic and vibronic excitation.
University of Würzburg, Experimental Physics VII, 97074 Würzburg, Germany.
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M
Graus
University of Würzburg, Experimental Physics VII, 97074 Würzburg, Germany.
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M
Grimm
University of Würzburg, Experimental Physics VII, 97074 Würzburg, Germany.
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Metzger
University of Bayreuth, Theoretical Physics IV, 95440 Bayreuth, Germany.
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Dauth
Max Planck Institute of Microstructure Physics, 06120 Halle, Germany.|Peter Grünberg Institut (PGI-6), Forschungszentrum Jülich GmbH, 52425 Jülich, Germany.
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Tusche
Max Planck Institute of Microstructure Physics, 06120 Halle, Germany.
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J
Kirschner
University of Bayreuth, Theoretical Physics IV, 95440 Bayreuth, Germany.
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Kümmel
University of Würzburg, Experimental Physics VII, 97074 Würzburg, Germany.
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Schöll
University of Würzburg, Experimental Physics VII, 97074 Würzburg, Germany.
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Reinert