Complexes of Copper,Silver, and Molybdenum with Glucofuranose Phosphoramidites

Complex formation of 1,2;5,6-di-O-isopropylidene--D-glucofuranos-3-yl phosphorodiamidite and bis(1,2;5,6-di-O-isopropylidene--D-glucofuranos-3-yl) phosphoramidite with copper(I) and silver bromides and molybdenum hexacarbonyl is carried out.     

Cross Sections for Solar-Neutrino Capture by the 76Ge Nucleus and High-Lying Gamow—Teller Resonances

Physics of Atomic Nuclei - The cross section σ(Eν) for solar-neutrino capture by the 76Ge nucleus is calculated. The effect of Gamow-Teller resonances on the rate of neutrino capture in...     

Synthesis of O-Aryl N4-Glycosyl(thiosemicarbazido)phosphonothioates

A reaction of aryl(aryloxy)thiophosphonic acids hydrazides with glycosyl isothiocyanates was studied. Amides of N-(glycosylthioureylene)aryl(aryloxy)thiophosphonic acids were synthesized. The structure and composition of the new compounds were confirmed by the data of IR, ¹H and ³¹P NMR and mass spectra, and by results of elemental analyses.     

The reactivity of 3,5-dimethylidene-2,2,6,6-tetramethyl-4-oxopiperidin-1-oxyl and its diamagneticN-methyl analog in nucleophilic addition of amines and diels—Alder dimerization

3,5-Dimethylidene-1,2,2,6,6-pentamethyl-4-oxopiperidine was shown by the kinetic method to be less reactive than 3,5-dimethylidene-2,2,6,6-tetramethyl-4-oxopiperidin-1-oxyl in the nucleophilic addition of secondary amines and Diels—Alder dimerization. According to the quantum-chemical AM1 calculations, this is due to the difference in the structures of the activated complexes (in the reactions with amines) and to the “press” effect created by theN-methyl group that impedes the necessary cycle flattening (in the Diels—Alder reaction). Published inIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 10, pp. 1698–1702, October, 2000.     

Coherent Raman scattering in molecular hydrogen in a dc electric field

The polarization properties of light in coherent Raman scattering in molecular hydrogen in a dc electric field are investigated. A nonlinear polarization-optical method of determining the absolute magnitude and orientation of the dc electric field is proposed and realized. Pis’ma Zh. éksp. Teor. Fiz. 70, No. 6, 371–375 (25 September 1999)     

Coherent Raman and hyper-Raman spectroscopy of excited and autoionizing states of atoms and ions in laser-produced and electric-discharge plasma

Summary The experimental results on four-wave Raman and hyper-Raman scattering in a laser-produced and electric-discharge plasma are presented. It has been shown that in spectra of four-wave mixing processes resonances appear due to the Raman and hyper-Raman scattering on atomic and ionic excited states. The temporal behaviour of the scattered-signal intensity has been found to be connected with the population relaxation of atomic and ionic excited states. We have observed for the first time the resonance in the spectrum of coherent hyper-Raman scattering in electric-discharge plasma associated with the electron transition between the excited and autoionizing state of a copper atom. Paper presented at the ?XI European CARS Workshop?, Florence, Italy, 23–25 March, 1992.     

Laser nonlinear-optical probing of silicon/SiO2 interfaces: Surface stress formation and relaxation

A nonlinear optical technique based on optical second harmonic generation in reflection is shown to provide information on the surface layer structure of semiconductor crystals, thin films and layered systems. The second harmonic intensity is sensitive to inhomogeneous stress in centrosymmetric materials via spatial selection rules and the appearance of an electric dipole contribution to the second order nonlinear optical susceptibility. The technique is used to monitor mechanical stress relaxation in the SiO₂/Si interface during several annealing procedures.