V.A. Chernov

EXAFS study of the organometallic polymers PdnC60 structure

Abstract A series of new organometallic polymers, Pd n C 60 , with varying Pd C 60 ratios was prepared and studied using EXAFS spectroscopy. The Pd K-edge EXAFS analysis suggests that the Pd atoms act as bridges between adjacent C 60 molecules by coordination to the pi-electrons of their double bonds. The distance between the Pd atom and the nearest carbon atoms PdC 1 (2.27(3) A) is found to be somewhat longer than that in typical Pd(O)-elefin pi-complexes.

Fabrication and performance characteristics of a NiC multilayer grating for hard X-rays

Abstract We have fabricated and tested a lamella multilayer grating for the hard X-ray range with a grating period of 0.97 μm and a Ni C multilayer period of 4.0 nm. To obtain large size gratings the fabrication process included holographic lithography and ion-beam etching. The reflectivity measurements obtained using a triple-axis diffractometer have shown that the diffraction efficiency and the relative intensities of the diffracted orders strongly depend on the incident angle. A very encouraging result is the possibility to direct practically all diffracted energy to any one first order with total suppression of the other orders.

Synchrotron radiation and free electron laser activities at SSRC

Abstract In the last decade the Siberian SR Centre has implemented a wide program of SR and FEL research in cooperation with various research centres and institutions in Russia and abroad. The report illustrates this program, including joint experiments with the use of SR and FEL sources available at the Budker Institute of Nuclear Physics (INP), the implementation of new joint projects in Novosibirsk and at other centres, as well as the delivery of equipment designed and fabricated at the Budker INP or in collaboration with the Russian industry. Some technical information about the SR storage rings, wigglers, undulators and free electron lasers which are being constructed, used or developed at Budker INP is given as well.

An experimental study of the q⊥-dependence of X-ray resonant diffuse scattering from multilayers

Abstract A study of X-ray resonant diffuse scattering from the W/Si multilayer was performed to examine its dependence on the momentum transfer normally to the specular diffraction plane, q⊥. The data obtained show two evident disagreements with the present theoretical approximations. Firstly, when the incident angle was approximately equal to the Bragg angle, additional scattering concentrated in the specular diffraction plane was observed. Secondly, the q⊥-dependence of the quasi-Bragg scattering intensity obtained from these experiments is not the same, at least at the small momentum transfer, as can be obtained from the scans in the specular diffraction plane, having tendency to accumulate near this plane. The possible reasons for these phenomena are discussed.

X-ray performance of multilayer gratings: recent advances at SSRC

Abstract In this paper we present the main results at the fabrication, theoretical and experimental studies of X-ray multilayer gratings. The multilayer grating reflectivity measurements in both hard and soft X-rays were performed. The features observed in these experimental data are identified and interpreted by means of numerical simulation method of eigenvectors. The effects of diffuse X-ray scattering from Ni/C multilayer and Ni/C multilayer grating have been investigated. Novel aspects of polychromatic optics based on the application of the multilayer grating in hard X-rays are discussed.

MULTILAYER GRATING AS A SR MONOCHROMATOR FOR MOSSBAUER SPECTROSCOPY

Abstract The nuclear resonant diffraction of synchrotron radiation (SR) from a multilayer grating (MG) is theoretically investigated. The nuclear scattering of SR to one of the first orders of the MG allows one to suppress greatly the nonresonant SR scattering. The advantages of the MG as a SR monochromator for Mossbauer spectroscopy are studied. A new type of nuclear MG with the spatical lateral modulation of magnetic field is proposed. The possibility of a complete separation of Mossbauer photons from SR by this grating is shown

The application of the X-ray standing wave method to study NiC layered structures obtained by laser-assisted deposition

Abstract The X-ray standing wave method using fluorescence yield mode was applied to study the profile of the component-by-component distribution between Ni and C layers in Ni C layered structures produced by laser-assisted deposition. The method of recurrent relationships was used to calculate the standing wave electric field profile, and to reconstruct the Ni deep distribution. Best fitting was obtained if the intermixing thickness was equal to 3–4 A.

EXAFS study of ferrocene intercalated in fluorographite

Abstract EXAFS spectroscopy was applied to investigate the local intercalate structure in ferrocene-fluorographite. The EXAFS of the Fe K edge reveals a decrease of the intramolecular FeC bond length. This is attributed to interlayer compression of the ferrocene molecules by the fluorographite layers.

An extended anomalous fine structure of X-ray quasi-Bragg diffuse scattering from multilayers

Abstract An X-ray quasi-Bragg diffuse scattering anomalous fine structure technique was probed near the absorption Ni K-edge to study the interfacial structure of the Ni/C multilayer deposited by the laser ablation. Like other combinations of the EXAFS and diffraction techniques, this method has a spatial selectivity and was shown qualitatively to provide atomic structural information from the mixed interfacial layers. The possibilities and advantages of this technique are discussed.

Erratum to: “Status of the Siberian Synchrotron Radiation Center”: [Nucl. Instr. and Meth. A 543 (2005) 1]

Erratum to: ‘‘Status of the Siberian Synchrotron Radiation Center’’ [Nucl. Instr. and Meth. A 543 (2005) 1] A.I. Ancharov, V.B. Baryshev, V.A. Chernov, A.N. Gentselev, B.G. Goldenberg, D.I. Kochubei, V.N. Korchuganov, G.N. Kulipanov , M.V. Kuzin, E.B. Levichev, N.A. Mezentsev, S.I. Mishnev, A.D. Nikolenko, V.E. Panchenko, V.F. Pindyurin, M.A. Sheromov, B.P. Tolochko, M.R. Sharafutdinov, A.N. Shmakov, N.A. Vinokurov, P.D. Vobly, K.V. Zolotarev Institute of Solid State Chemistry and Mechanochemistry of SB RAS, 630090 Novosibirsk, Russian Federation Budker Institute of Nuclear Physics of SB RAS, 630090 Novosibirsk, Russian Federation Boreskov Institute of Catalysis SB RAS, 630090 Novosibirsk, Russian Federation