Research in Molecular Laser Plasmas by N. G. Basov (auth.), N. G. Basov (eds.)

By N. G. Basov (auth.), N. G. Basov (eds.)

This quantity experiences investigations which shape a part of a huge sequence of theoretical and experimental stories being performed within the Laboratory of Low-Temperature Plasma Optics on the Lebedev Physics Institute in Moscow. The papers supply the result of systematic investigations of the chemical composition and of and optical houses of dis­ cost plasmas, and likewise of populations of laser degrees. trustworthy and unique info is given at the dissociation of carbon dioxide fuel in discharges; the character of the rate dis­ tribution functionality, typical energies, and densities of electrons; and populations and vibrational temperatures of molecules in cw CO and CO lasers. 2 the cloth during this quantity is meant for experts in quantum electronics and coffee­ temperature plasma diagnostics. v CONTENTS Investigations of Physicochemical homes of CO Laser Plasma 2 V. N. Ochkin creation •. . •. . . . 1 bankruptcy I Dissociation of CO Molecules in a CO Laser Gas-Discharge Plasma. • . • • • . • • • • three 2 2 §1. short evaluation of Investigations of Dissociation of CO in 2 electric Discharges. • • • . . • . . • • • • • • . • • • • • • • • • • . . • • • • • • three §2. technique for deciding upon fuel Composition. • • • • • • • • • • • • • • • • • • . . • . 6 §3. Dissociation of CO in a Continuous-Flow Laser method. • • • • . . • . .

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However, it follows from theoretical considerations and recent experiments [79] that there is an intense energy exchange (mainly because of the Fermi resonance) between the symmetric and deformation vibrations. The rate of this exchange is comparable with the exchange within the vibrational modes. This not only complicates the picture but also allows us to introduce a unified vibrational temperature for both types of vibration. We shall assume that this temperature is approximately equal to the gas temperature.

It is clear from Fig. 18b that, in the first discharge in the working mixture (curve I), the amount of C~ rapidly fell during the first 3-4 h. The tube was then pumped out and again tested under the same conditions (curve 2). In this case, the loss was slower than in the first case and even slower during the next run (curve 3). The conditioning in xenon for 10 h was then repeated and new tests were carried out. Once again, there was a rapid reduction in the amount of C~ (curve 4), which slowed down during subsequent runs (curve 5).

The degree of dissociation of water vapor in the discharge did not exceed 10%. It was interesting to note that, within the limits of the experimental error (± 30%), the density of the OH radicals was unaffected by the presence of H20 vapor or H2. In spite of the fact that the density of the OH radicals was relatively low, their high reactivity could alter conSiderably the rate of oxidation of CO to C~: CO + OHC~ + H, resulting in a reduction in the steady-state degree of dissociation of carbon dioxide in a discharge.

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