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Single and multi domain buckled germanene phases on Al(111)surface

Nano Research 2019年第12期12卷 2988-2996页

作者： Dmitriy A.Muzychenko Sergey i.oreshkin Vladimir i.Panov Chris Van Haesendonck andrey i.oreshkin Faculty of Physics Lomonosov Moscow State University119991 MoscowRussia Sternberg Astronomical institute Lomonosov Moscow State University119234 MoscowRussia Solid-State Physics and Magnetism Section KU LeuvenBE-3001 LeuvenBelgium

The simultaneous formati on of single domain(3×3)and multi domai n(√7×√7)R(±19.1°)germa nene phases on Al(111)surface in thesub-monolayer range was studied using seanning tunneling microscopy(STM)and density functional theory(DFT)based *** results revealed that both germa nene phases nu cleate and grow in dependently from each other and regardless of Al substratetemperature within significantly expanded range Ts=27-200℃.Our results unambiguously showed that STM images with hexagonalcontrast yield correct-resolved structure for both germanene phases,while honeycomb contrast is a result of an artificial tip-induced STM ***-principles calculations suggested atomic models with strongly buckled germanene(2×2)/Al(111)(3×3)and(√3×√3)R30°/Al(111)(√7×√7)R(±19.1°)with one of eight and one of six Ge atoms protruding upward respectively,that consistently describe the experimentally observed STM images both for single and multi domai n surface *** to the DFT based simulati ons both germa nene(2×2)and(√3×√3)R30°superstructures have a stretched lattice strain with respect to the ideal free-standing germa nene by 6.2%and 13.9%,***,numerous small domains separated by domain boundaries in the(√3×√3)R30°/Al(111)(√7×√7)R(±19.1°)germanenephase tend to reduce the surface energy and prevent the formation of extended single domains,in contrast to the(2×2)/Al(111)(3×3)***,our experimental results showed that the nucleation and growth of germa nene on Al(111)surface yield strong modifications of Alsurface even at room temperature(RT),which may be contributed to the formation of Al-Ge alloy due to Ge surface solid-states reactivitythat was ignored in recent *** is already evident from our present findings that the role of Al atoms in the formation of(3×3)and(√7×√7)R(±19.1°)germa nene phases is worthy to be carefully studied in the future,which could be an important knowledge for large-quantityfabrication of germane

关键词： germanene two-dimensional(2D)materials scanning tunneling microscopy density functional theory aluminum

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Real-time decay of fluorinated fullerene molecules on Cu（001） surface controlled by initial coverage

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Nano Research 2018年第4期11卷 2069-2082页

作者： andrey i. oreshkin Dmitry A. Muzychenko Sergey i. oreshkin Vladimir A. Yakovlev Palanichamy Murugan S. Selva Chandrasekaran Vijay Kumar Rauf Z. Bakhtizin Department of Physics Lomonosov Moscow State University 119991 Moscow Russia Sternberg Astronomical institute Lomonosov Moscow State University 119234 Moscow Russia institute of Petrochemical Synthesis Russian Academy of Sciences 119991 Moscow Russia CSiR Central Electrochemical Research institute Karaikudi 630003 Tamil Nadu India Dr. Vijay Kumar Foundation 1969 Sector 4 Gurgaon 122001 Haryana India Center for informatics School of Natural Sciences Shiv Nadar University NH91 Tehsil Dadari Gautam Budh Nagar 201314 Uttar Pradesh India Department of Physical Electronics Bashkir State University 450074 Ufa Russia

in this study, the evolution of C60F18 molecules on a Cu（001） surface was studied by means of scanning tunneling microscopy and density functional theory calculations. The results showed that fluorinated fuUerenes （tortoise-shaped polar C60F18） decay on Cu（001） surfaces by a step-by-step detachment of F atoms from the C60 cage. The most favorable adsorption configuration was realized when the F atoms of C60F18 pointed towards the Cu surface and six F atoms were detached from it. The results also showed that a further decay of C60F12 molecules strongly depended on the initial C60F18 coverage. The detached F atoms initially formed a two-dimensional （2D） gas phase which then slowly transformed into F-induced surface structures. The degree of contact between the C60F12 molecules and the Cu（001） surface depended on the density of the 2D gas phase. Hence, the life-time of fluorinated fullerenes was determined by the density of the 2D gas phase, which was affected by the formation of new F-induced structures and the decay of C60F12 molecules.

关键词： fluorinated fullerene (001) Cu surface two-dimensional (2D)molecular island 2D gas phase self-assembling molecules scanning tunneling microscopy (STM) density functional theory(DFT)

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Review of high-power pulsed systems at the institute of High Current Electronics

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Matter and Radiation at Extremes 2016年第4期1卷 201-206页

作者： A.A.Kim B.M.Kovalchuk V.A.Kokshenev A.V.Shishlov N.A.Ratakhin V.i.oreshkin V.V.Rostov V.i.Koshelev V.F.Losev institute of High Current Electronics Siberian BranchRussian Academy of Sciences2/3 Academichesky Ave.Tomsk 634055Russia

in this paper,we give a review of some most powerful pulsed systems developed at the institute of High Current Electronics(HCEi),Siberian Branch,Russian Academy of Sciences,and describe latest achievements of the teams dealing with these *** the presented high-power systems,HCEi performs numerous investigations using much less powerful *** instance,last year much attention was paying to the research and development of the intense low-energy(igh-current electron and ion beam and plasma sources,and their application in the technology[1-3].

关键词： Energy storage systems Z-pinch High power microwaves High power laser Linear pulse transformer Linear transformer driver

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Measurement of J/ψ→η_cγ at KEDR

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Chinese Physics C 2010年第6期34卷 831-835页

作者： V.V.Anashin V.M.Aulchenko E.M.Baldin A.K.Barladyan A.Yu.Barnyakov M.Yu.Barnyakov S.E.Baru i.V.Bedny O.L.Beloborodova A.E.Blinov V.E.Blinov A.V.Bobrov V.S.Bobrovnikov A.V.Bogomyagkov A.E.Bondar A.R.Buzykaev S.i.Eidelman Yu.M.Glukhovchenko V.V.Gulevich D.V.Gusev S.E.Karnaev G.V.Karpov S.V.Karpov T.A.Kharlamova V.A.Kiselev S.A.Kononov K.Yu.Kotov E.A.Kravchenko V.F.Kulikov G.Ya.Kurkin E.A.Kuper E.B.Levichev D.A.Maksimov V.M.Malyshev A.L.Maslennikov A.S.Medvedko O.i.Meshkov A.i.Milstein S.i.Mishnev i.i.Morozov N.Yu.Muchnoi V.V.Neufeld S.A.Nikitin i.B.Nikolaev i.N.Okunev A.P.Onuchin S.B.oreshkin i.O.Orlov A.A.Osipov S.V.Peleganchuk S.G.Pivovarov P.A.Piminov V.V.Petrov A.O.Poluektov i.N.Popkov G.E.Pospelov V.G.Prisekin A.A.Ruban V.K.Sandyrev G.A.Savinov A.G.Shamov D.N.Shatilov B.A.Shwartz E.A.Simonov S.V.Sinyatkin Yu.i.Skovpen A.N.Skrinsky V.V.Smaluk A.V.Sokolov A.M.Sukharev E.V.Starostina A.A.Talyshev V.A.Tayursky V.i.Telnov Yu.A.Tikhonov K.Yu.Todyshev G.M.Tumaikin Yu.V.Usov A.i.Vorobiov A.N.Yushkov V.N.Zhilich V.V.Zhulanov A.N.Zhuravlev Budker institute of Nuclear Physics Novosibirsk State University Novosibirsk State Technical University

We present a study of the inclusive photon spectra from 5.9 million J/ψ decays collected with the KEDR detector at the VEPP-4M e＋e collider. We measure the branching fraction of radiative decay J/ψ→ηcγ, ηc width and mass. Our preliminary results are： M（ηc） = 2979.4± 1.5 ± 1.9 MeV/c^2, Г（ηc） = 27.8±5.1 ±3.3 MeV, B（Jψ→ηcγ） = （2.34±0.15±0.40）%.

关键词： ηc meson full width mass radiative decay

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Recent results from the KEDR detector

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Chinese Physics C 2010年第6期34卷 650-655页

作者： V.V.Anashin V.M.Aulchenko E.M.Baldin A.K.Barladyan A.Yu.Barnyakov M.Yu.Barnyakov S.E.Baru i.V.Bedny O.L.Beloborodova A.E.Blinov V.E.Blinov A.V.Bobrov V.S.Bobrovnikov A.V.Bogomyagkov A.E.Bondar A.R.Buzykaev S.i.Eidelman Yu.M.Glukhovchenko V.V.Gulevich D.V.Gusev S.E.Karnaev S.V.Karpov T.A.Kharlamova V.A.Kiselev S.A.Kononov K.Yu.Kotov E.A.Kravchenko V.F.Kulikov G.Ya.Kurkin E.A.Kuper E.B.Levichev D.A.Maksimov V.M.Malyshev A.L.Maslennikov A.S.Medvedko O.i.Meshkov S.i.Mishnev i.i.Morozov N.Yu.Muchnoi V.V.Neufeld S.A.Nikitin i.B.Nikolaev i.N.Okunev A.P.Onuchin S.B.oreshkin i.O.Orlov A.A.Osipov S.V.Peleganchuk S.G.Pivovarov P.A.Piminov V.V.Petrov A.O.Poluektov i.N.Popkov V.G.Prisekin A.A.Ruban V.K.Sandyrev G.A.Savinov A.G.Shamov D.N.Shatilov B.A.Shwartz E.A.Simonov S.V.Sinyatkin Yu.i.Skovpen A.N.Skrinsky V.V.Smaluk A.V.Sokolov A.M.Sukharev E.V.Starostina A.A.Talyshev V.A.Tayursky V.i.Telnov Yu.A.Tikhonov K.Yu.Todyshev G.M.Tumaikin Yu.V.Usov A.i.Vorobiov A.N.Yushkov V.N.Zhilich V.V.Zhulanov A.N.Zhuravlev Budker institute of Nuclear Physics Novosibirsk State University Novosibirsk State Technical University 20Karl Marx prospectNovosibirsk630092Russia

We report results of experiments performed with the KEDR detector at the VEPP-4M e^＋e^- collider. They include precise measurement of the D^0 and D^± meson masses, determination of the ψ（3770） resonance parameter... 详细信息

关键词： D meson ψ(3770) mass narrow resonances

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Bremsstrahlung Radiation of Fast Electrons in Long Air Gaps

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Journal of Energy and Power Engineering 2012年第6期6卷 906-911页

作者： oreshkin Evgeny Chaikovsky Stanislav Oginov Alexander Shpakov Konstantin The Lebedev Physical institute Russian Academy of Sciences Moscow 119991 Russia

The results of an experiment on discharges in long atmospheric pressure air gaps at a pulsed voltage of amplitude up to 800 kV and risetime 150-200 ns are analyzed. in the experiment, a radiation pulse of photon energy > 5 keV and duration 10-20 ns has been detected. it has been shown that the x-ray pulse is due to the "runaway" of electrons from the head of an anode-directed streamer. The estimated maximum bremsstrahlung energy is about 5-10 keV. The presence of a maximum in the bremsstrahlung spectrum is due to that the photons emitted by electrons are absorbed by atoms of the gas in which the discharge operates.

关键词：电子轫致辐射空气间隙中长脉冲电压光子能量轫致辐射谱大气压力上升时间

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