Degeneracy Lifting of Adsorbate Orbitals Imaged by High-Resolution Momentum Microscopy

On the topical example of the symmetry splitting of degenerate orbitals due to adsorption we drive the technique oforbital imaging by momentum microscopy (k-PEEM) ahead, demonstrating the potential of the method when performedwith high accuracy in terms of experimental quality, energy resolution and...

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Bibliographic Details
Published in:	Journal of the Physical Society of Japan 2018-06, Vol.87 (6), p.61009
Main Authors:	Graus, Martin, Metzger, Christian, Grimm, Manuel, Feyer, Vitaliy, Puschnig, Peter, Schöll, Achim, Reinert, Friedrich
Format:	Article
Language:	eng
Subjects:	Adsorbates Adsorption Energy resolution Image resolution Mapping Metal phthalocyanines Microscopy Molecular physics Momentum Orbitals Substrates Symmetry
Online Access:	Get full text
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Summary:	On the topical example of the symmetry splitting of degenerate orbitals due to adsorption we drive the technique oforbital imaging by momentum microscopy (k-PEEM) ahead, demonstrating the potential of the method when performedwith high accuracy in terms of experimental quality, energy resolution and data evaluation. Upon adsorption on thetwofold symmetric substrate Ag(110), the symmetry of Iron-phthalocyanine reduces from fourfold two twofold, leadingto distinct binding energies of the two e1g orbitals which constitute the twofold degenerate lowest unoccupied molecularorbital of the gas-phase molecule. In this combined experimental and theoretical study, we show that by k-PEEM withhigh energy resolution the individual orbitals can be identified and distinguished by mapping in momentum space.
ISSN:	0031-9015 1347-4073