Modulations of valence-band photoemission spectrum from (formula presented) monolayers on Ag(111)

Ton-That, C; Egger, S; Welland, ME; Shard, AG; Dhanak, VR

Modulations of valence-band photoemission spectrum from (formula presented) monolayers on Ag(111)

Ton-That, C

Egger, S Welland, ME Shard, AG Dhanak, VR

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Publication Type:: Journal Article
Citation:: Physical Review B - Condensed Matter and Materials Physics, 2003, 67 (15)
Issue Date:: 2003-04-29

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Field	Value	Language
dc.contributor.author	Ton-That, C https://orcid.org/0000-0003-3276-1739	en_US
dc.contributor.author	Egger, S	en_US
dc.contributor.author	Welland, ME	en_US
dc.contributor.author	Shard, AG	en_US
dc.contributor.author	Dhanak, VR	en_US
dc.date.issued	2003-04-29	en_US
dc.identifier.citation	Physical Review B - Condensed Matter and Materials Physics, 2003, 67 (15)	en_US
dc.identifier.issn	1098-0121	en_US
dc.identifier.uri	http://hdl.handle.net/10453/434
dc.description.abstract	The photon-energy dependences of valence-band photoemission spectra have been investigated for monolayer, submonolayer, and multilayer (formula presented) films on Ag(111). The intensity ratios of the highest and next-highest occupied molecular orbitals (the HOMO and NHOMO) of the films are found to oscillate with the same period as the incident photon energy is varied, but the amplitude of the oscillation is smaller with lower film coverage. Since the characteristics of the molecular orbitals of (formula presented) in the monolayers are considerably different from those of the thick film due to the charge-transfer interaction between the metallic surface and the molecule the observation opposes the proposal in which the oscillation is entirely dependent on the nature of the empty and occupied states involved in the photoemission process. The results instead support the photoelectron interference model by Hasegawa et al. [Phys. Rev. B 58, 4927 (1998)]. Variation of the oscillation amplitude with (formula presented) coverage is explained in terms of hybridization of the HOMO and NHOMO with the surface. Depositing (formula presented) onto Ag(111) held at a high temperature produces a single-phase (formula presented) (formula presented) (formula presented) monolayer. Angle-resolved photoemission experiments reveal changes in the relative intensities of the two bands with the azimuth-emission angle, measured with respect to the symmetry axes of the ordered monolayer. The intensity modulation is due to anisotropic scattering of photoelectrons along various molecular axes. © 2003 The American Physical Society.	en_US
dc.relation.ispartof	Physical Review B - Condensed Matter and Materials Physics	en_US
dc.relation.isbasedon	10.1103/PhysRevB.67.155415	en_US
dc.subject.classification	Fluids & Plasmas	en_US
dc.title	Modulations of valence-band photoemission spectrum from (formula presented) monolayers on Ag(111)	en_US
dc.type	Journal Article
utslib.citation.volume	15	en_US
utslib.citation.volume	67	en_US
utslib.for	0204 Condensed Matter Physics	en_US
utslib.for	02 Physical Sciences	en_US
utslib.for	03 Chemical Sciences	en_US
utslib.for	09 Engineering	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Faculty of Science/School of Mathematical and Physical Sciences
utslib.copyright.status	closed_access
pubs.issue	15	en_US
pubs.publication-status	Published	en_US
pubs.volume	67	en_US

Abstract:

The photon-energy dependences of valence-band photoemission spectra have been investigated for monolayer, submonolayer, and multilayer (formula presented) films on Ag(111). The intensity ratios of the highest and next-highest occupied molecular orbitals (the HOMO and NHOMO) of the films are found to oscillate with the same period as the incident photon energy is varied, but the amplitude of the oscillation is smaller with lower film coverage. Since the characteristics of the molecular orbitals of (formula presented) in the monolayers are considerably different from those of the thick film due to the charge-transfer interaction between the metallic surface and the molecule the observation opposes the proposal in which the oscillation is entirely dependent on the nature of the empty and occupied states involved in the photoemission process. The results instead support the photoelectron interference model by Hasegawa et al. [Phys. Rev. B 58, 4927 (1998)]. Variation of the oscillation amplitude with (formula presented) coverage is explained in terms of hybridization of the HOMO and NHOMO with the surface. Depositing (formula presented) onto Ag(111) held at a high temperature produces a single-phase (formula presented) (formula presented) (formula presented) monolayer. Angle-resolved photoemission experiments reveal changes in the relative intensities of the two bands with the azimuth-emission angle, measured with respect to the symmetry axes of the ordered monolayer. The intensity modulation is due to anisotropic scattering of photoelectrons along various molecular axes. © 2003 The American Physical Society.

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