Photoemission Tomography of a One-Dimensional Row Structure of a Flat-Lying Picene Multilayer on Ag(110)

Abstract

We applied photoemission tomography (PT) to a unique one-dimensional row structure of a picene multilayer realized on an anisotropic Ag(110) surface. Taking advantage of the simplified structure of the multilayer film, we successfully deconvoluted the photoelectron momentum maps of three frontier orbitals of picene. Thereafter, the clearly deconvoluted experimental momentum maps were compared to the Fourier transform simulation of the molecular orbitals of picene in detail, enabling not only the evaluation of the electronic structure of the picene in the multilayer but also the determination of the molecular orientation in the multilayer within a few degrees. In addition, the PT results indicated the orientation of the molecules in all layers to be flat-lying. The successful demonstration of PT of the multilayer molecular film marks an important step toward the wide-range utilization of the PT technique.

Development of dual-beamline photoelectron momentum microscopy for valence orbital analysis

“…By combining momentum-selected PEEM known as the dark-field imaging technique (Matsui et al, 2022;Hashi-moto et al, 2022) with photon polarization, exotic orbital structures in real space such as charge-orbital order can be visualized (Mizokawa et al, 2016). Detailed analysis of the electronic structure of ordered molecular adsorbates is another important scientific goal (Puschnig et al, 2009;Iwasawa et al, 2022;Nozaki & Konishi, 2024). Real-space imaging by utilizing circularly polarized light in the normalincidence geometry allows so-called magnetic circular dichroism (MCD)-PEEM, visualizing perpendicular ferromagnetic domains (Locatelli & Mentes ¸, 2015;Taniuchi et al, 2015).…”

Partial Hydrogenation of N-Heteropentacene upon Vacuum Deposition

“…The background pressure during the sublimation of BTANC was approximately 1.0 × 10 –6 Pa. To evaluate the chemical states of BTANC thin film, in situ XPS was performed at beamline BL13B of the KEK-PF facility with a base pressure of approximately 1.0 × 10 –8 Pa. An excitation photon energy was set to 1500 eV. The investigation of the structure of the BTANC monolayer was conducted using an in situ STM system with a base pressure of approximately 1.0 × 10 –8 Pa. , All the XPS measurements and STM imaging were done at room temperature. STM images were processed using the WSxM software …”

Prospects required for future light-source facilities: a case of UVSOR synchrotron facility

“…In FY2020, we started the development of imaging for photoelectron spectroscopy. We are currently working on a project to fully evaluate electronic states by spin-resolved photoelectron momentum microscope with SR excitation [16][17][18][19][20][21][22][23][24][25][26][27], which will be a pioneer project of its kind in Japan. It is expected that multimodal measurements in complex systems will lead to a new landscape of materials science.…”