Absorption of high-power microwave radiation in the plasma of the decaying optical breakdown of a gas

Abstract

For the first time a microwave discharge located in the plasma of decaying optical breakdown of gas (air and argon at atmospheric pressure) has been generated. Four beams (each with a power of up to 100 kW) were injected sequentially into a volume of ionized rarefied gas which had been generated before hand by -laser radiation. The absorption was 50%, the maximum duration of the interaction of the microwave radiation with the plasma was 0.3-2 ms and was limited by the process of turbulent cooling. Depending on the parameters of the absorbing medium and microwave radiation a semi-self-maintained or self-maintained discharge with a diffusion or spark structure has been generated. A model for the calculation of basic characteristics of the decaying optical breakdown of a microwave discharge in it was suggested.

Preparation of sodium salts of N‐sulfonic acids by sulfomethylation of nitro oligomers obtained from waste rubbers

“…Through the sulfomethylation of phenols or novolac resins based on phenols, synthetic tanning agents8 and sulfo derivatives have been obtained that reduce the viscosity of clay solutions used for oil and gas drilling 9…”