Coherence properties of submicron GaAs/AlGaAs rings with a ferromagnetic gate

In the present work, the Aharonov–Bohm effect in submicron GaAs/AlGaAs ring with an in-plane ferromagnetic gate is investigated. The experiment is based on the study of the derivatives of magnetoresistance and microwave EMF to gate voltage. The experimental results are explained by electron wave interference in the presence of an inhomogeneous magnetic field in the ring.     

Isotopic relations for derivatives of the dipole moment of multiatomic molecules

The method of investigating the isotopic dependence in multiatomic molecules proposed earlier by the authors is used to obtain isotopic relations for the first and second derivatives with respect to the normal coordinates; these hold in the case of arbitrary isotope substitution in multiatomic molecules. For some special cases, relationships between the integrated intensities of the isotopic modifications of a molecule are also determined.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 10, pp. 80–84, October, 1980.We are very grateful to Professor L. M. Sverdlov for a helpful discussion of the work.     

Fibrant Extensions and Conditions of Movability

The concept of a fibrant extension of compacta can be used in the study of some properties related to different conditions of movability. For example, "empty" strong shape components of a given compact metric space X correspond to those path components of a fibrant extension X of X which do not intersect X. The fibrant extension X can be constructed as a cotelescope of an ANR-sequence associated with X. Using this representation of X, we prove the following: If a continuum is movable and virtually pointed 1-movable, then it is pointed movable. As a corollary, we get immediately that movable continua, which do not have "empty" strong shape components, are pointed movable. In particular, continua, both fibrant and movable, are of this kind. In fact, they are locally path connected approximate polyhedra. This revised version was published online in June 2006 with corrections to the Cover Date.     

The 3nu(2) Band of D(2)(16)O

The 3nu(2) overtone band of deuterium oxide, D(2)O, centered at 3474.3193 cm(-1), has been measured with high resolution in a 4-m base-length White cell attached to a Fourier transform spectrometer. The analysis of the spectrum led to the assignment of 347 transitions in this band, defining rovibrational energy levels in the (030) state up to K(a) = 7 for J as high as 9, and lower K(a) levels for J as high as 16. The (030) state was treated as an isolated state, following a Padé-Borel approximation in the effective Hamiltonian. Of the 115 energy levels included in the analysis, 80% were reproduced by the 21 adjusted parameters to within 0.0008 cm(-1), and the largest error was 0.0017 cm(-1). Copyright 2000 Academic Press.     

Magnetooptical effects in the metal-dielectric gratings

A significant enhancement of the magnetooptical Faraday effect in the bilayer heterostructure of a thin metallic layer pierced by an array of parallel subwavelength slits and a uniform dielectric layer magnetized perpendicular to its plane, is reported. Calculations, based on the rigorous coupled-wave analysis of Maxwell’s equations, demonstrate that in such structures the Faraday effect spectrum has several resonance peaks in the near-infrared range, some of them coinciding with transmittance peaks, providing simultaneous large Faraday rotation enhanced by an order and high transmittance of about 35%. It is shown that the excitation of the quasi-guided TM- and TE-modes in the dielectric layer mostly governs the enhancement of the Faraday rotation.     

Calculation of the energy levels of excited vibrational states of the HD16O molecule by summing divergent series of the Rayleigh-Schrödinger perturbation theory. The shift of zero-order levels

The Rayleigh-Schrödinger perturbation theory is applied to calculation of the energy levels of excited vibrational states of the HD¹⁶O molecule. The model of coupled anharmonic oscillators is considered, with the anharmonic part of potential energy being taken into account as the perturbation. The calculations are carried out for the vibrational states that correspond to three-to seven-fold vibrational excitations. Since the perturbation series diverge in the case of strong resonance interactions and their approximations by the Padé and Padé-Hermite methods do not yield sufficiently correct results, a calculation technique is applied that allows the zero-order approximation to be modified. The zero-order Hamiltonian is modified by shifting the vibrational frequencies, which decreases the mixing of states. The new Rayleigh-Schrödinger series can be summed using the quadratic Padé-Hermite approximation method.     

Use of Pulsed Radiography for Investigation of Equations of State of Substances at Megabar Pressures

A method of density measurement for substances that are isentropically compressed up to megabar pressures is described in the paper. Measurement results for condensed hydrogen isotopes and aluminum are presented. These results, afterwards, are used for construction of hydrogen isotopes “cold” isentropes. Experimental x‐ray images of the facilities with the hydrogen isotopes, compressed up to several megabars are presented in the paper (© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)     

Synthesis and structure of (acetylacetonato-κ<Superscript>2</Superscript>-O,O′)(bistriphenylphosphine)palladium tetrafluoroborate as a precursor of catalysts active in the conversion of unsaturated hydrocarbons

An X-ray diffraction analysis is carried out for the complex [Pd(Acac)(PPh₃)₂]BF₄ (I), which is a precursor of the active complexes of styrene dimerization and norbornene additive polymerization in the system [(Acac)Pd(PPh₃)₂]BF₄-BF₃ · OEt₂. In complex I the palladium atom is coordinated by two oxygen atoms of the acetylacetonate ligand and two phosphorus atoms of the triphenylphosphine ligands at the vertices of the distorted square.