Gas-chromatographic method for the analysis of n-mercaptans and symmetrical n-sulfides and n-disulfides

Conclusions A gas-chromatographic method for the identification of a mixture of mercaptans and symmetrical sulfides and disulfides with the help of equations relating the retention index to the number of carbon atoms and the boiling points of the compounds studied is proposed.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 6, pp. 1399–1401, June, 1970.     

General equation to describe the dependence of the gas holdup time on the initial temperature and program rate in temperature-programmed gas chromatography

Summary The influence of the program rate and initial temperature on the holdup time in linear temperature-programmed gas chromatography was studied. An equation describing the dependence of the holdup time on the program rate and the initial temperature is given. Experimental verification of the equation was carried out on three capillary columns coated with stationary phases having different polarities, at three program rates and four initial temperatures. Enlarged text of the paper presented at the Eighth International Symposium on Capillary Chromatography, Riva del Garda, Italy, May 19–21, 1987.     

A method of calculating the specific retention volumes of substances from their retention indices and specific retention volumes of n-alkanes

The choice of stationary phase for gas chromatography is dictated by the nature of the analytes. Polarity and selectivity are known to play an important role. This paper suggests equations for calculation of specific retention volumes of any compounds from their retention indices.     

Kinematic mechanism of the modulation of the spectral intensity in the spatially uniform system of Hubbard fermions

Using the exact representation of the Green’s function constructed in terms of the Hubbard operators, it has been shown that the kinematic interaction that induces the spin-fluctuation processes in the spatially uniform system of Hubbard fermions leads to significant variations in the spectral intensity A(k, ω) in the Brillouin zone. As a result, the modulation of A(k, ω) appears in the Fermi contour. The sign of the hopping integral within the first coordination sphere is determined by the contour section, where A(k, ω) decreases according to the angle-resolved photoemission spectroscopy data.