Zobrazeno 1 - 10
of 81
pro vyhledávání: '"Kenneth M. Beck"'
Publikováno v:
The Journal of Physical Chemistry C. 115:692-699
We report qualitatively new highly hyperthermal (HHT) oxygen atom emission from nanostructured CaO excited by 6.4 eV nanosecond laser pulses. The kinetic energy distribution of emitted O-atoms peaks at 0.7 eV, which is over 4 times greater than previ
Autor:
Gang Xiong, J. Y. Wang, Joseph S. DuChene, Wayne P. Hess, Rui Shao, Alan G. Joly, Wei Wei, Kenneth M. Beck, M. Cai, Samuel J. Peppernick
Publikováno v:
JOM. 62:90-93
Photoelectron emission microscopy (PEEM) is a versatile technique that can image a variety of materials including metals, semiconductors and even insulators. Under favorable conditions the most advanced aberration corrected instruments have a spatial
Publikováno v:
Applied Physics A. 101:61-64
When an ionic metal oxide crystal is cleaved, inhomogeneous electrical charging of the surface can be a result. Such an effect has been well documented in magnesium oxide (100). For example, recent rigorous AFM studies indicate that nanoscale charged
Publikováno v:
Applied Surface Science. 255:9707-9711
Indium selenide thin films are important due to their applications in non-volatile memory and solar cells. In this work, we present an initial study of a new application of deposition-site selective laser back ablation (LBA) for making thin films of
Publikováno v:
Applied Surface Science. 255:9562-9565
Neutral magnesium atom emission from nanostructured MgO thin films is induced using two-color nanosecond laser excitation. We find that combined vis/UV excitation, for single-color pulse energies below the desorption threshold, induces neutral Mg-ato
Autor:
Paolo E. Trevisanutto, Kenneth M. Beck, PV Sushko, Wayne P. Hess, Alexander L. Shluger, Alan G. Joly
Publikováno v:
The Journal of Physical Chemistry C. 113:1274-1279
Nanoparticles of wide band gap materials MgO and CaO, subjected to low-intensity ultraviolet irradiation with 266 nm (4.66 eV) photons, emit hyperthermal oxygen atoms with kinetic energies of up to ∼0.4 eV. We use an ab initio embedded cluster meth
Autor:
Marjorie A. Olmstead, Fumio S. Ohuchi, Patrick J. Shamberger, Kenneth M. Beck, Alan G. Joly, Chill-Yuan Lu, Esmeralda N. Yitamben
Publikováno v:
Applied Physics A. 93:93-98
Phase transformation of thin film (∼30 nm)In2Se3/Si(111) (amorphous→crystalline) was performed by resistive annealing and the reverse transformation (crystalline→amorphous) was performed by nanosecond laser annealing. As an intrinsic-vacancy, b
Autor:
Kenneth M. Beck, Paolo E. Trevisanutto, Peter V. Sushko, Oliver Diwald, Alan G. Joly, Alexander L. Shluger, Slavica Stankic, Wayne P. Hess
Publikováno v:
Surface Science : A Journal Devoted to the Physics and Chemistry of Interfaces
Surface Science : A Journal Devoted to the Physics and Chemistry of Interfaces, 2008, 602 (11), pp.1968-1973. ⟨10.1016/j.susc.2008.03.046⟩
Surface Science : A Journal Devoted to the Physics and Chemistry of Interfaces, 2008, 602 (11), pp.1968-1973. ⟨10.1016/j.susc.2008.03.046⟩
International audience; We excite low-coordinated surface sites of nanostructured MgO samples using 4.7 eV UV laser pulses and observe dominant hyperthermal O-atom emission. Excitation of the same samples with 7.9 eV photons results in thermal O-atom
Autor:
Gang Xiong, Rui Shao, Kenneth M. Beck, Scott A. Chambers, Timothy C. Droubay, Wayne P. Hess, Alan G. Joly
Publikováno v:
Advanced Functional Materials. 17:2133-2138
Photoemission electron microscopy (PEEM) excited by x-ray and UV sources is used to investigate epitaxial anatase thin films embedded with rutile nanocrystals, a model system for the study of heterocatalysis on mixed-phase TiO2. Both excitation sourc
Autor:
Wayne P. Hess, Kenneth M. Beck, Gang Xiong, Stephen C. Langford, J. T. Dickinson, M. Cai, Timothy C. Droubay, Alan G. Joly
Publikováno v:
Journal of Nuclear Materials. 361:306-312
Thermally-induced martensitic phase transformations in polycrystalline CuZnAl and thin-film NiTiCu shape memory alloys were probed using photoemission electron microscopy (PEEM). Ultra-violet photoelectron spectroscopy shows a reversible change in th