@incollection{WeichertGasparZybinetal.2010, author = {Weichert, F. and Gaspar, M. and Zybin, A. and Gurevich, E. L. and G{\"o}rtz, A. and Timm, C. and M{\"u}ller, H. and Marwedel, P.}, title = {Plasmonen-unterst{\"u}tzte Mikroskopie zur Detektion von Viren}, series = {Bildverarbeitung f{\"u}r die Medizin 2010}, booktitle = {Bildverarbeitung f{\"u}r die Medizin 2010}, publisher = {Springer}, address = {Berlin}, isbn = {978-3-642-11967-5}, year = {2010}, language = {en} } @article{AstrovKozlovLodyginetal.2009, author = {Astrov, Yu. A. and Kozlov, V. A. and Lodygin, A. N. and Portsel, L. M. and Shuman, V. B. and Gurevich, E. L. and Hergenr{\"o}der, R.}, title = {Redistribution of deep selenium and sulfur impurities in silicon upon surface doping with phosphorus}, series = {Semiconductors}, volume = {43}, journal = {Semiconductors}, issn = {1063-7826}, doi = {10.1134/S1063782609060049}, pages = {710 -- 715}, year = {2009}, abstract = {The study is concerned with the effect of short-term high-temperature heating on Si:Se and Si:S samples, whose surface layers are doped with phosphorus to high concentrations. It is found that the resistivity of the wafers substantially increases deep in the bulk within up to similar to 10 mu m. The experimental data suggest that this effect is due to enhanced diffusion of chalcogen in the presence of the phosphorus-doped surface region. The mechanism of the effect is the injection of nonequilibrium interstitial silicon atoms from the layer heavily doped with phosphorus to the bulk of the sample. This results in a shift of the equilibrium between the concentrations of substitutional and interstitial impurity atoms towards higher concentrations of interstitials and, as a consequence, towards the increase in the relative content of the fast-diffusing interstitial component of the impurity.}, language = {en} } @article{GurevichHergenroeder2009, author = {Gurevich, E. L. and Hergenr{\"o}der, R.}, title = {The production of free-standing large aspect ratio metal nanofilms by femtosecond laser separation}, series = {Nanotechnology}, volume = {20}, journal = {Nanotechnology}, issn = {0957-4484}, doi = {10.1088/0957-4484/20/27/275609}, pages = {275609}, year = {2009}, abstract = {We demonstrate a new method for the production of free-standing metal films of thickness down to several tens of nanometres. Films of different metals as well as multilayer structures have been produced by means of femtosecond laser-induced separation of evaporated layers from a plane glass surface. This technology enables the production of large-area films with different properties for optical or nanotechnological applications. We study the properties of the film and demonstrate the possibility of high-pass filtering of electrons with an energy of several keV by means of the free-standing films. The physical mechanisms leading to the film separation under femtosecond laser radiation are discussed.}, language = {en} } @article{MonticelliGurevichHergenroeder2009, author = {Monticelli, D. and Gurevich, E. L. and Hergenr{\"o}der, R.}, title = {Design and performances of a cyclonic flux cell for laser ablation}, series = {J. An. At. Spectr.}, volume = {24}, journal = {J. An. At. Spectr.}, issn = {0267-9477}, doi = {10.1039/b807991a}, pages = {328 -- 335}, year = {2009}, abstract = {A new simple design of a high-efficiency low-transport-time cell for laser ablation is presented. The main feature of the design is that the particles are transported by a laminar spiral gas flow into the outlet without any contact with the cell walls. The efficiency of the particle transport and the dependence of the ICP-MS peak shape on experimental conditions were measured. The peak duration on the 10\% level was found to be as short as 30 ms and the transport efficiency reached 100\% when analysing a standard brass sample. As an example of application to real samples with fine inhomogeneities, the profiles of C-13, Ca-44 and Pb-208 were measured by LA-ICP-MS across a tree core. As a result, the very quick particle transport time of the cell enabled the fine, seasonal variation in wood composition to be resolved.}, language = {en} } @article{ThomasLinZhigileietal.2009, author = {Thomas, D. A. and Lin, Z. and Zhigilei, L. V. and Gurevich, E. L. and Kittel, S. and Hergenr{\"o}der, R.}, title = {Atomistic modeling of femtosecond laser-induced melting and atomic mixing in Au film - Cu substrate system}, series = {Appl. Surf. Sci.}, volume = {255}, journal = {Appl. Surf. Sci.}, issn = {0169-4332}, doi = {10.1016/j.apsusc.2009.04.079}, pages = {9605 -- 9612}, year = {2009}, abstract = {The mechanisms of femtosecond laser-induced transient melting and atomic mixing in a target composed of a 30 nm Au film deposited on a bulk Cu substrate are investigated in a series of atomistic simulations. The relative strength and the electron temperature dependence of the electron-phonon coupling of the metals composing the layered target are identified as major factors affecting the initial energy redistribution and the location of the region(s) undergoing transient melting and resolidification. The higher strength of the electron-phonon coupling in Cu, as compared to Au, results in a preferential sub-surface heating and melting of the Cu substrate, while the overlaying Au film largely retains its original crystalline structure. The large difference in the atomic mobility in the transiently melted and crystalline regions of the target makes it possible to connect the final distributions of the components in the resolidified targets to the history of the laser-induced melting process, thus allowing for experimental verification of the computational predictions. (C) 2009 Elsevier B. V. All rights reserved.}, language = {en} } @article{GurevichHergenroeder2007, author = {Gurevich, E. L. and Hergenr{\"o}der, R.}, title = {A simple laser ICP-MS ablation cell with wash-out time less than 100 ms}, series = {J. An. At. Spectr.}, volume = {22}, journal = {J. An. At. Spectr.}, issn = {0267-9477}, doi = {10.1039/b704700b}, pages = {1043 -- 1050}, year = {2007}, abstract = {In this paper a novel concept of ablation cell for laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) is presented. Suppression of the turbulence in the flush gas flow in the ablation region reduces the wash-out time of the ablation cell considerably. An ablation chamber which enables ICP-MS pulse duration down to several ten milliseconds has been designed. Dependence of the ICP-MS peak amplitude, width, and shape on the gas flow parameters is studied experimentally for aerosol ablated under laminar and turbulent conditions. Experiments demonstrate that the ICP-MS peak becomes sharper and the amplitude of the signal grows as the turbulence in the ablation cell is suppressed. Furthermore, the possibility of the LA-ICP-MS analysis with a sampling rate of more than 10 Hz has been demonstrated. Express in-depth profiling in the new ablation cell is demonstrated on examples of an Al -Zn multilayer structure and an industrial Mg -Zn coating.}, language = {en} } @article{GurevichHergenroeder2007, author = {Gurevich, E. L. and Hergenr{\"o}der, R.}, title = {Femtosecond laser-induced breakdown spectroscopy: Physics, applications, and perspectives}, series = {Appl. Spectroscopy}, volume = {61}, journal = {Appl. Spectroscopy}, issn = {0003-7028}, pages = {233A -- 242A}, year = {2007}, language = {en} } @article{KhareBrinkmannLawetal.2007, author = {Khare, K. and Brinkmann, M. and Law, B. M. and Gurevich, E. L. and Herminghaus, S. and Seemann, R.}, title = {Dewetting of liquid filaments in wedge-shaped grooves}, series = {Langmuir}, volume = {23}, journal = {Langmuir}, issn = {0743-7463}, doi = {10.1021/la701515u}, pages = {12138 -- 12141}, year = {2007}, abstract = {The dewetting of liquid filaments in linear grooves of a triangular cross section is studied experimentally and theoretically. Homogeneous filaments of glassy polystyrene (PS) are prepared in triangular grooves in a nonequilibrium state. At elevated temperatures, the molten PS restores its material contact angle with the substrate. Liquid filaments with a convex liquid-vapor interface decay into isolated droplets with a characteristic spacing depending on the wedge geometry, wettability, and filament width. This instability is driven by the interplay of local filament width and Laplace pressure and constitutes a wide class of ID instabilities that also include the Rayleigh -Plateau instability as a special case. Our results show an accurately exponential buildup of the instability, suggesting that fluctuations have a minor influence in our system.}, language = {en} } @article{GurevichRaizerPurwins2006, author = {Gurevich, E. L. and Raizer, Y. P. and Purwins, H.-G.}, title = {Self-sustained oscillations in a low-current discharge with a semiconductor serving as a cathode and ballast resistor: I. Experiment}, series = {Tech. Phys.}, volume = {51}, journal = {Tech. Phys.}, issn = {1063-7842}, doi = {10.1134/S106378420602006X}, pages = {180 -- 184}, year = {2006}, abstract = {Self-sustained current oscillations in a Townsend discharge that is excited in a short plane discharge gap and is uniform along the electrode surface are investigated experimentally. A thin semiconductor plane serves as a discharge cathode, a ballast resistor, and an additional capacitor in the dc power supply circuit. The domain of existence and the frequency and waveform, of oscillations are determined over a wide pressure range.}, language = {en} } @article{RaizerGurevichMokrov2006, author = {Raizer, Y. P. and Gurevich, E. L. and Mokrov, M. S.}, title = {Self-sustained oscillations in a low-current discharge with a semiconductor serving as a cathode and ballast resistor: II. Theory}, series = {Tech. Phys.}, volume = {51}, journal = {Tech. Phys.}, issn = {1063-7842}, doi = {10.1134/S1063784206020071}, pages = {185 -- 197}, year = {2006}, abstract = {Current self-sustained oscillations in a Townsend discharge are studied analytically. The proposed method for solving simple equations is applicable even when the Townsend coefficient of electron reproduction g (the main factor governing the oscillations) cannot be determined theoretically. The coefficient g is related to the discharge current-voltage characteristic, which can be obtained experimentally or from numerical simulations. Self-oscillating solutions (limit cycles) are found under various conditions. The mechanisms governing the excitation and stabilization of the solutions obtained are interpreted. It is shown that the waveform of the undamped oscillations may change significantly (the current peaks are smoothed, and the oscillation period decreases) when a weak constant cathode current, which is presumably related to the emission caused by slowly diffusing metastable molecules, is included in the equations.}, language = {en} }