The near infrared (0.8−2.6µm) absorption spectrum of a dense sodium vapor and possible mechanisms of the spectrum formation

The absorption coefficient of a dense sodium vapor (N₀ ～ 10¹⁷–10¹⁸ cm^{? 3}) in the near infrared spectral range (0.8–2.6 µm) was measured in a homogeneously heated isolated cell. In the range of parameters studied, the sample exhibits significant absorption. Neither the observed spectral features nor the measured absorption coefficients can be explained using the existing notions of the possible absorption mechanisms (absorption due to a forbidden intercombination transition, collision-induced processes, the trimer vapor component, and many-particle effects) and the available data.     

Hydrocarbalkoxylation of cyclohexene and carbalkoxylation of cyclohexanol with formic esters

Conclusions Mixtures of the esters of the 1-methylcyclopentanecarboxylic and cyclohexanecarboxylic acids were obtained in a 48 ratio by the hydrocarbalkoxylation of cyclohexene and the carbalkoxylation of cyclohexanol with alkyl formates at atmospheric pressures and temperatures of 10–30° in the presence of acids.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 3, pp. 704–705, March, 1973.     

Estimate of the Remainder of the Best Quadratic Approximation of Differentiable Functions by Polynomials

We establish lower and upper bounds for the quantity

Synchrotron radiation from a longitudinally polarized relativistic spinning particle in pseudoclassical theory

The spin dependence of the intensity and polarization of synchrotron radiation from a longitudinally polarized particle moving at a constant speed along a circle in a uniform magnetic field is investigated within the pseudoclassical approach.     

Spontaneous dehydrogenation of 2-hydrazinoethyl- and 4-hydrazinobut-2-enylphosphonium salts

2-Hydrazinoethyl- and 4-hydrazinobut-2-enylphosphonium salts undergo spontaneous dehydrogenation leading to the corresponding hydrazones or diazenes, depending on the structure of the starting compounds or the reaction conditions. A possible mechanism of the trans-formations is discussed.