The Interference of Magnetoelastic Waves in an Yttrium Iron Garnet Film

Physics of the Solid State - The interference of excited and received by current antennae magnetoelastic waves counterpropagating in an yttrium iron garnet film is experimentally studied. It is...     

Synthesis,electronic structure,and physicochemical characteristics of pyrazolo[1,2-a]pyridazinium

The interaction of 1-methallylpyrazoles with acetic or propionic anhydride in the presence of perchloric acid forms products of acylation at the double bond and subsequent heterocyclization — pyrazolo[1,2-a]pyridazinium salts — that are representatives of a new heteroaromatic system. Analogous cyclization is observed in the acylation of 3-(2-hydroxy-2-methylpropyl-pyrazole.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 12, pp. 1623–1631, December, 1990.     

Chemistry of 1,5-diketone derivatives. 1. Oxidation of 8a-methoxy-4a,5,6,7,8,8a-hexahydrochromenes by monoperphthalic acid

2-(2-Oxo-3-hydroxy-1,3-diphenylpropyl)cyclohexanone, 2-(2,3-dioxo-1,3-diphenylpropyl)cyclohexanone, and 2-benzyl-7a-hydroxy-3-phenylperhydrobenzofuran are formed by the action of monoperphthalic acid on 8a-methoxy-2,4-diphenyl-4a,5,6,7,8,8a-hexahydrochromene. Under analogous conditions, 4a-methoxy-10-phenyl-1,2,3,4, 4a,6,7,8,9,10a-decahydroxanthene forms 7a-hydroxy-3-phenyloctahydrobenzo[b]furan-2-spiro-1-cyclohexan-2-one and its dehydration product. The behavior of the compounds obtained toward acetic anhydride and a methanolic solution of HCl was studied. The configurations of the reaction products and the reaction path are considered.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 2, pp. 177–181, February, 1985.     

Adiabatic Potential Energy Surface of the 1,2,3-Trifluorobenzene Cation-Radical

Ab initio study of the adiabatic potential energy surface (PES) for 1,2,3-trifluorobenzene cation-radical was carried out by the ROHF, UHF, MCSCF, MP2, and DFT (B3LYP) methods with the 6-31G* basis set. The PES in question is a pseudorotation surface at all calculation levels. The pseudorotation barrier height does not exceed 3.2 kcal/mol, suggesting a possibility for its manifestations in experimental EPR spectra.     

MINDO/3 calculation of the atom—Atom self- and mutual polarizabilities for a hydrocarbon series

A MINDO/3 calculation based on the Hartree—Fock perturbation theory gave the atom—atom self- and mutual polarizabilities of a series of hydrocarbons. A study was carried out on the effect of the perturbation-induced distortion of the electron—electron interaction and molecular relaxation on the calculated values.Translated from Teoreticheskaya i Éksperimental'naya Khimiya, Vol. 31, No. 4, pp. 227–231, July–August, 1995.     

Reactions of 1, 5-diketones

The Chichibabin pyridine synthesis with methylenedicyclohexanone and tricyclohexanolone has been studied. It has been shown that under the conditions of the synthesis tricyclohexanolone is previously isomerized into methylenedicyclohexanone. The reaction products are sym-octahydroacridine, 12-hydroxy-¹⁰-dodecahydroacridine, and 5-azabicyclo [8,4,0]tetradecane-6,11-dione. The latter two substances are the products of the conversion of the ¹⁰-dodecahydroacridine that arises as an intermediate.For part I, see [1].     

Conditions for generation of X-ray cherenkov radiation during motion of charges in realistic media

The influence of the spatial distribution of electrons, atoms, and nuclei in condensed media on a medium’s susceptibility and on the conditions for the formation of short-wavelength Cherenkov radiation are considered. It is shown that taking into account the inhomogeneous (atomic and electronic) structure of material media in which fast charged particles travel leads to a change in the effective susceptibility and permittivity in the X-ray range, as compared with cases of model homogeneous media with the same average concentration of electrons. The influence of the distribution functions of electrons and nuclei in a target on the conditions for Cherenkov radiation generation and its parameters and on the threshold energy of fast charged particles required to generate such radiation is studied. It is shown that the function of the spatial distribution of electrons and nuclei in a target affects the conditions for generating laser radiation in the X- and λ-ray ranges (on the problem of X- and λ-ray lasers). The obtained results show that using the Fresnel approximation in the X-ray range is insufficiently justified and can lead to significant errors.