Hydrocarbon radiolysis in the presence of carboranes(12) 3. Formation of product hydrocarbons

Conclusions A study has been made of the effect of o-carborane on hydrocarbon formation in the radiolysis of n-heptane. The introduction of o-carborane into the n-heptane system reduced the yield of intermediate and dimeric hydrocarbon products. The inhibiting effect of o-carborane traces back to its electron-acceptor activity and its ability to deactivate the excited n-heptane molecule.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 7, pp. 1507–1510, July, 1977.The authors would like to thank V. A. Brattsev for advice on matters of technique.     

Study of the energy stability of ultra-short pulses from an yttrium-aluminium garnet laser

The energy stability of ultra-short pulses (USPs) from an yttrium-aluminium garnet laser with passive mode locking (PML) has been investigated. Experimental results of passive mode locking based on solutions of widely used dyes are given for comparison. Using these saturable absorbers we found that the energy distribution of USP did not depend on the laser working frequency nor on the duration of the experiment.     

Quantum field methods in the theory of diffusion-controlled reactions

The diagrammatic perturbation technique for the kinetic theory of classical reacting systems with diffusion is developed. It is further applied to investigation of recombination-type reactions in media of one, two, and three dimensions. The effective rates of this reaction are calculated, covering the whole range from the slow to the fast (diffusion-controlled) regimes.     

Neutron activation determination of impurities in germanium

A neutron activation (NA) method for the determination of 24 microimpurities in germanium has been developed. The method is based on the separation of the matrix and isotopes genetically connected by extraction chromatography.