Electron spin density distribution in the polymer phase of CsC60: assignment of the NMR spectrum

We present high resolution 133Cs-13C double resonance NMR data and 13C-13C NMR correlation spectra of 13C enriched samples of the polymeric phase of CsC60. These data lead to a partial assignment of the lines in the 13C NMR spectrum of CsC60 to the carbon positions on the C60 molecule. A plausible completion of the assignment can be made on the basis of an ab initio calculation. The data support the view that the conduction electron density is concentrated at the C60 "equator," away from the interfullerene bonds.     

Piecewise-constant approximation of the potential profile of multiple quantum well intrinsic heterostructures

Knowledge of the energy band diagram is very important in semiconductor physics due to the fact that the band diagram influences almost all parts of the physics of a semiconductor device. In this paper we examine a piecewise-constant approximation of the potential profile through a comparison with a comprehensive self-consistent model, with regard to the active regions of QW semiconductor lasers and amplifiers. The validity of this approximation is then defined, thus giving an insight into the physics of QW structures.     

NMR, EPR, and mass spectroscopy estimates of the antiradical activity of water with modified isotope composition

The dynamics of the change in the deuterium content in plasma of laboratory animal blood is studied by nuclear magnetic resonance spectroscope using water with modified isotope composition. The change in deuterium content in lyophilized animal tissues is determined by mass spectrometry. The content of paramagnetic centers in a dose and in pathology is determined on an electron paramagnetic resonance spectrometer.     

Nuclear spin relaxation,hybridization, and low-temperature 4f spin fluctuations in intermediate-valent SmB6

¹¹B spin-lattice relaxation measurements have been carried out in SmB₆ samples with large low-temperature resistivities. Above 15 K the relaxation is activated, with approximately the same gap (≈6 meV) as found previously in transport and optical measurements. 4f spin fluctuations apparently dominate the relaxation, so that these results give strong evidence for 4f-conduction band hybridization at the gap edge. An anomalous peak in the relaxation rate was observed at ≈5 K, which is tentatively attributed to fluctuations of “remagnetized” Sm³⁺ ions near Sm-site vacancies.     

Kinetics of the collision of metallic plates in a multilayer packet during explosion welding

Volgograd. Translated from Prikladnaya Mekhanika i Tekhnicheskaya Fizika, No. 5, pp. 173–175, September–October, 1994     

Possibility of generating a sequence of attosecond subpulses upon second harmonic generation of high-intensity femtosecond pulses in an optically extended medium

Optics and Spectroscopy - Based on numerical simulation, we demonstrate the possibility of forming a sequence of equalintensity coupled subpulses upon second harmonic generation (SHG) of a...     

Dynamics of Exciplex Formations and Dissociation in Organic Molecule Vapors

The discovery and investigation of exciplex luminescence in the polyatomic molecule vapors^1-4 is of great importance for better understanding of the relaxation mechanisms in bimolecular complexes formed due to the charge transfer between photo-excited organic molecules and other type of molecules in the ground state. The study of the vapor-phase exciplex emission from 9, 10-dicyanoanthracene in the presence of N, N-dimethylaniline (9, 10-DCA + DMA) showed⁴ that the exciplex stabilities, their luminescence properties and the relative efficiency of monomer and exciplex luminescence essentially depend on the excess of the vibrational energy of excited 9, 10-DCA molecules.     

Nonstationary absorption spectra from aminophenylthiyl radicals

Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 49, No. 6, pp. 949–954, December, 1988.