【表面と真空 (Vacuum and Surface Science)】は，2018年4月の日本表面科学会と日本真空学会の合併により設立された公益社団法人 日本表面真空学会が出版する学術論文誌です。設立に先立つ2018年1月に創刊された新しいジャーナルになります。前身誌は日本真空学会の【Journal of the Vacuum Society of Japan】と日本表面科学会の【表面科学】になり，双方の記事種を踏襲し，その上で新たな分野への展開を目指しています。巻号は，歴史のより長い【Journal of the Vacuum Society of Japan】の巻数を引き継ぎ，第61巻からの創刊となります。
The Division of Microbeam Analysis, the Japan Society of Vacuum and Surface Science, publishes the Database for Auger and Secondary Electron Spectra online (https://www.jvss.jp/division/mba/sedb/). These spectral data were measured with an SI traceable cylindrical mirror analyzer developed by Keisuke Goto (absolute measurement system). The database body stores measurement data and spectra of 56 materials and 47 materials as an appendix. This paper reports the concept and characteristics of the absolute measurement system and introduces the electron spectra database.
For realizing single molecular devices using metal-molecule-metal junction, it is necessary to fabricate a steady conductive bridge-structure. Recently, our group reported a molecular bridging method using migration of gold atoms on static nanogap electrodes. It was proposed that repeated cycles of single-molecular-bridging and breaking between benzene-di-thiolate (BDT) molecules and nanogap electrodes using this method. In this paper, to confirm the bridging condition during the cycles, current-voltage curves in each state were investigated. This result indicates that characteristic orbital energies of BDT were revealed while observed conductance was close with 11.0 mG0. On the other hand, when the observed conductance was below 11.0 mG0, the magnitude of estimated orbital energies was the similar as that using nanogap electrodes which were not covered by any molecules, which explained that direct tunneling conduction between Au electrodes was dominant. This clearly indicates that cycles between molecular-bridging and disconnection were realized using static nanogap structures.
Germanene, a graphene-like honeycomb crystal of germanium, has been attracting immense attention owing to its exotic properties such as a tunable bandgap and high carrier mobility. However, the fabrication of germanene-based electronic devices is difficult owing to its chemical instability. To overcome this problem, we proposed and developed a new method of germanene growth at graphene/Ag(111) and hexagonal boron nitride/Ag(111) interfaces. The grown germanene at the interfaces was stable in air and uniform over the entire area covered with a van der Waals (vdW) material. As an important finding, a vdW interface provides a nanoscale platform for growing germanene similarly to that in vacuum, while this cannot be achieved with a typical oxide interface (Al2O3). We believe that our work is of significantly importance not only for the growth of germanene but also for the fabrication of future germanene-based electronic devices.
Quasi-Nanbu scheme, a new inter-molecular collision scheme proposed in the previous work, has been extended to diatomic molecules and gas mixtures. Then, the extension has been implemented in a Direct Simulation Monte Carlo (DSMC) model created on a commercial FEM software COMSOL Multiphysics®. N2 gas heat conduction between parallel plates and two-dimensional supersonic nozzle flows of gas mixtures are demonstrated as application examples.
Photoelectron angular distribution from the valence state of π-conjugated molecules on the surface has been studied to clarify the molecular orientation quantitatively with multiple scattering theory of photoelectron emission intensity. After developing the photoelectron emission techniques together with molecular thin-film preparations, a novel concept of photoemission tomography enables to investigate the electronic states in depth to understand the molecular functional properties in a sense of orbital. The article reviews the recent progress and development of the photoelectron momentum microscope related techniques for molecular science.