Near-IR laser inelastic electronic light scattering spectroscopy on transitions between ground and excited states of acceptor centers in GaAs and InP crystals

We report the development of a method for recording the low-temperature (T=6 K) near-IR inelastic light scattering spectra and the observation of electronic scattering on the transitions 1s _3/2(Γ₈) → 2s _3/2(Γ₈) between the ground and excited states of different shallow acceptor centers in a n-type semi-insulating crystal si-GaAs (n=1.0 × 10⁸ cm⁻³) and in a doped p-InP crystal (p=3.6×10¹⁷ cm⁻³). Moreover, a new line, associated with the transition 1s _3/2(Γ ₈) → 2p _3/2(Γ₈) and due to a dielectric local mode, recorded for the first time in the spectra of narrow-gap semiconductors, was found in the residual-frequency band in the p-InP spectrum between TO(Γ) and LO (Γ) phonons. Pis’ma Zh. éksp. Teor. Fiz. 67, No. 5, 334–339 (10 March 1998)     

Spectral singularities of Klein-Gordon s-wave equations with an integral boundary condition

We investigate the spectral singularities and the eigenvalues of the boundary value problem $$\begin{gathered} y'' + \left[ {\lambda - Q\left( x \right)} \right]^2 y = 0,x \in R_ + = [0,\infty ), \hfill \\ \quad \int\limits_0^\infty {K\left( x \right)y\left( x \right)dx + \alpha y'\left( 0 \right) - \beta y\left( 0 \right) = 0,} \hfill \\ \end{gathered}$$ where Q and K are complex valued functions, K∈L ²(R ₊), α,β∈C with |α|+|β|≠0 and λ is a spectral parameter.     

Diene condensation of allylacetylene and some of its derivatives with polychlorocyclic dienes

Conclusions The diene condensation of allylacetylene and some of its derivatives with hexachloro- and 5,5-dimethoxytetrachlorocyclopentadiene proceeds only at the vinyl group to give the corresponding acetylenic adducts.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 6, pp. 1358–1362, June, 1980.     

Synthesis and properties of unsaturated thietanes

Reaction of unsaturated epichlorohydrins with sodium sulfide in aqueous-alcoholic solution leads to 3-hydroxythietanes. Ethers of the latter can be prepared by phase transfer catalysis using acetic anhydride and alkyl halides.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 11, pp. 1477–1479, November, 1990.     

Synthesis and study of cooligomers of <Emphasis Type="Italic">p</Emphasis>-isopropenylphenyl λ-chlorobutyrate with styrene

Free-radical cooligomerization of a new polyfunctional monomer, p-isopropenylphenyl λ-chlorobutyrate, with styrene was studied.     

On the Characteristic Properties of Exponential Distribution

New characterizations for the exponential distribution are given in terms of record values and the probabilities of finite sums of independent and identically distributed nonnegative random variables provided that the underlying distribution is either new better than used or new worse than used.     

Optical Characterization of the Structural and Electrical Properties of the n-GaP Nanolayers Grown on Conductive (001) n-GaP Substrates

Physics of the Solid State - The results of investigations of the structural and electrical properties of a homoepitaxial nanoscale (001) n-GaP layer of 70 nm in thickness grown by metalorganic...     

Synthesis of co-oligomers of 2-propenylphenol with maleic anhydride and study of products of their transformations with amines as steel corrosion inhibitors

Modification with diethylamine and diethanolamine of co-oligomers of 2-propenylphenol with maleic anhydride yielded water-soluble nitrogen-containing derivatives inhibiting the corrosion of St.3 steel in watersalt solutions.