TY - JOUR A1 - Gurevich, E. L. A1 - Kittel, S. A1 - Hergenröder, R. T1 - Experimental and numerical study of surface alloying by femtosecond laser radiation JF - Appl. Surf. Sci. Y1 - 2012 SN - 0169-4332 VL - 258 SP - 2576 EP - 2579 ER - TY - JOUR A1 - Gurevich, E. L. A1 - Kittel, S. A1 - Hergenröder, R. A1 - Astrov, Yu A. A1 - Portsel, L. M. A1 - Lodygin, A. N. A1 - Tolmachev, V. A. A1 - Ankudinov, A. V. T1 - Modification of GaAs surface by low-current Townsend discharge JF - J. Phys. D: Appl. Phys. N2 - The influence of stationary spatially homogeneous Townsend discharge on the (1 0 0) surface of semi-insulating GaAs samples is studied. Samples exposed to both electrons and ions in a nitrogen discharge Y1 - 2010 U6 - http://dx.doi.org/10.1088/0022-3727/43/27/275302 SN - 0022-3727 VL - 43 SP - 275302 ER - TY - JOUR A1 - Astrov, Yu. A. A1 - Kozlov, V. A. A1 - Lodygin, A. N. A1 - Portsel, L. M. A1 - Shuman, V. B. A1 - Gurevich, E. L. A1 - Hergenröder, R. T1 - Redistribution of deep selenium and sulfur impurities in silicon upon surface doping with phosphorus JF - Semiconductors N2 - 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. Y1 - 2009 U6 - http://dx.doi.org/10.1134/S1063782609060049 SN - 1063-7826 VL - 43 SP - 710 EP - 715 ER - TY - JOUR A1 - Gurevich, E. L. A1 - Hergenröder, R. T1 - The production of free-standing large aspect ratio metal nanofilms by femtosecond laser separation JF - Nanotechnology N2 - 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. Y1 - 2009 U6 - http://dx.doi.org/10.1088/0957-4484/20/27/275609 SN - 0957-4484 VL - 20 SP - 275609 ER - TY - JOUR A1 - Monticelli, D. A1 - Gurevich, E. L. A1 - Hergenröder, R. T1 - Design and performances of a cyclonic flux cell for laser ablation JF - J. An. At. Spectr. N2 - 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. Y1 - 2009 U6 - http://dx.doi.org/10.1039/b807991a SN - 0267-9477 VL - 24 SP - 328 EP - 335 ER - TY - JOUR A1 - Thomas, D. A. A1 - Lin, Z. A1 - Zhigilei, L. V. A1 - Gurevich, E. L. A1 - Kittel, S. A1 - Hergenröder, R. T1 - Atomistic modeling of femtosecond laser-induced melting and atomic mixing in Au film - Cu substrate system JF - Appl. Surf. Sci. N2 - 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. Y1 - 2009 U6 - http://dx.doi.org/10.1016/j.apsusc.2009.04.079 SN - 0169-4332 VL - 255 SP - 9605 EP - 9612 ER - TY - JOUR A1 - Gurevich, E. L. A1 - Hergenröder, R. T1 - A simple laser ICP-MS ablation cell with wash-out time less than 100 ms JF - J. An. At. Spectr. N2 - 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. Y1 - 2007 U6 - http://dx.doi.org/10.1039/b704700b SN - 0267-9477 VL - 22 SP - 1043 EP - 1050 ER - TY - JOUR A1 - Gurevich, E. L. A1 - Hergenröder, R. T1 - Femtosecond laser-induced breakdown spectroscopy: Physics, applications, and perspectives JF - Appl. Spectroscopy Y1 - 2007 SN - 0003-7028 VL - 61 SP - 233A EP - 242A ER -