Spontaneous and induced Cherenkov radiation generated by electrons in cylindrical dielectrics

A theory of induced Cherenkov radiation in cylindrically symmetrical dielectrics in the case when an electron beam is moving close to the dielectric surface is presented. The spectrum of excited radiation modes has been investigated, and analytical expressions for the gain at the frequencies of various modes have been derived. Zh. éksp. Teor. Fiz. 111, 847–861 (March 1997)     

Heterogeneous catalytic transformation of isobutyl benzoate by the inverse Tishchenko reaction

Using the catalytic transformation of isobutyl benzoate at 663 K in the presence of 12 % MnO₂/-Al₂O₃ in a He atmosphere as an example, it has been shown that the inverse Tishchenko reaction can take place at a temperature above 600 K. Isobutyl benzoate gives isobutanal and benzaldehyde as well as products of their transformation,i.e., benzyl isobutyrate, isobutanol, benzyl alcohol, and toluene.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 8, pp. 1494–1496, August, 1994.     

Composition,properties, and structure of palladium(II) chlorides in aqueous solution

The composition, stability, and structure of palladium(II) chloride complexes in hydrochloric acid media have been determined using nuclear-magnetic relaxation, magnetochemical methods, and Rayleigh light scattering. The predominant form in solution for palladium(II) concentrations greater than 0.005 moles/liter is the octahedral Pd₆Cl₁₂ or Pd₆Cl₁₄ ^2–, which has antiferromagnetic properties in contrast with the paramagnetic properties of the mononuclear aquachloride. The polarizability anisotropy of Pd-Cl bonds with terminal and bridging chlorine atoms has been determined.Deceased.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 11, pp. 2473–2477, November, 1990.     

SUPRAMOLECULAR COMPOUNDS FORMED BY METAL-ORGANIC FRAMEWORKS AND ORGANIC PHOTOCHROMES. REVIEW

Journal of Structural Chemistry - In this review, Photoswitch@MOF materials, i.e. supramolecular compounds (hereinafter adducts) prepared by direct incorporation of organic photochromes into the...     

Selective NO reduction by propane over commercial oxide catalysts and their mechanical mixture: II. Intermediate complexes and reaction mechanism

Based on a spectrokinetic study (simultaneous measurements of the concentrations of surface complexes and reaction rate usingin situ IR spectroscopy), a hypothesis is proposed which explains synergism in the reaction of NO reduction by propane on a mechanical mixture of commercial oxide catalysts.     

Stable coherent coupling of laser diodes by a volume Bragg grating in photothermorefractive glass

Two separate laser diodes emitting near 980 nm were coupled by a thick volume Bragg grating recorded in a photothermorefractive glass. The coupled diodes emitted at the same wavelength with a spectral width narrowed to below the resolution of the spectrum analyzer (<30 pm). Coherent emission at a pumping level greater than five times above the threshold was observed for several months with near-unity visibility of the interference pattern.     

Adiabatic three-wave volume hologram: large efficiency independent of grating strength and polarization

A transmission hologram with two volume gratings is considered in the regime of wave A diffracted into wave B via an intermediate weakly excited wave C. In analogy to the phenomenon of stimulated Raman adiabatic passage in nonlinear optics, this new scheme demonstrates diffraction efficiency with low sensitivity to the hologram's strength. A theory of three-wave adiabatic coupling has been developed and explored analytically. Numerical results show an example of a coupling profile that preserves high diffraction efficiency with almost no dependence on the hologram's strength, including the suppressed influence of polarization.     

Exponentially damped operators for a harmonic oscillator linearly coupled to a heat bath

We consider the problem of the dissipative dynamics of a harmonic oscillator linearly coupled to a heat bath. We demonstrate that in addition to the mean energy, there exists an infinite series of quantities exponentially decreasing in time that are means of polynomials of the system Hamiltonian. We obtain the spectrum of the corresponding relaxation times. We propose a method for representing the time characteristics of the system in terms of operators corresponding to the exponentially damped observables. We obtain a recurrence relation for these operators.