Effective Hamiltonian for polyatomic linear molecules

The leading terms of an effective Hamiltonian for a linear molecule in a given vibrational state are presented up to κ¹⁰T_v order of magnitude, whereby higher-order l-dependent terms such as $\text{H}\text{?}{}_{12.0}$, $\text{H}\text{?}{}_{8.0}$, and $\text{H}\text{?}{}_{8.2}$ have been neglected because in spectroscopic application they are of minor importance. This Hamiltonian therefore includes all those l-type interactions which could contribute to the fitting procedure, within a vibrational state where one or more bending vibrations are excited.     

Potential energy of interaction between an electron and a molecule on the basis of slater atomic orbitals

General analytical expressions are obtained for the potential energy of the interaction between an electron and a molecule and the 2^L-pole electric moments of the molecules by the Hartree-Fock-Rutan method. These formulas are used for a machine calculation of the interaction potential between an electron and hydrogen and nitrogen molecules with different electron distances from these molecules and also of the electric multipole moments of a series of diatomic molecules with L = 0, 1, 2, 3.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 3, pp. 52–56, March, 1985.     

Superconductivity in CeCu2Si2

Resistivity measurements of CeCu₂Si₂ are carried out under pressures p up to 12 kbars. Unlike polycrystalline samples, no traces of superconductivity have been observed in CeCu₂Si₂ at ambient pressure. When pressure is applied, CeCu₂Si₂ monocrystals become superconducting with anomalously large ratio H_c2(0)/T_c (0) = 34 K0e/K and with the derivative dH_c2/dT(T=T_c) = 140 K0e/K     

Effects of conjugation and the conformational structure of aromatic selenides

Conclusions In the aromatic selenides, in contrast to the corresponding sulfides, the partial steric inhibition of the conjugation of the Se atom with the aromatic -system occurs. The appreciable content (30%) of the plane conformer is observed in compounds with the tertiary and quaternary -carbon atoms of the alkyl group; this explains the weak -donor properties of Se in relation to the aromatic fragment.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 1, pp. 64–69, January, 1989.The authors thank V. M. Bzhezovskii for helpful discussions, as well as V. I. Mamatyuk, R. G. Kostyanovskii, and I. I. Chervin for allowing the possibility of registering the¹³C NMR spectra of some of the investigated compounds.     

Reaction of some amines with unsaturated N-acylbenzoxazolones

It is shown that the addition of aniline proceeds at the carbon-carbon double bond of N-acryloyl-, N-chloroacryloyl-, and N-methylacryloylbenzoxazolones. The basicity of the amine has a substantial effect on the course of the reaction with various amines. Transamidation of the acryloyl residue occurs with strongly basic amines.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 8, pp. 1044–1048, August, 1974.