Numerical experiments in the technological process

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Modelling of gas flowing and heating in the cascaded arc and technological chamber

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Atomic hydrogen and argon ground state density determination in a recombining plasma using visible light absorption spectroscopy

The atomic radical density in the first excited state, obtained by the technique of optical absorption spectroscopy, and a simple kinetic model are used to determine the radical ground state density in a recombining expanding plasma. The kinetic model used does not require knowledge of the shape of the electron energy distribution function. The information on electron density and electron temperature has been derived from the Thomson-Rayleigh scattering diagnostic. The method is demonstrated for the determination of the absolute ground state densities of atomic hydrogen H(n=1) and argon Ar(3p6) in a freely expanding plasma jet

Fundamentals and application of an expanding hydrogen low-pressure plasma jet

The absolute density of atomic hydrogen excited states in two different regimes of a magnetized expanding plasma is determined using emission and absorption spectroscopy. First evidence has been found for the presence of high densities of negative ions in the atomic (recombining) regime of an expanding hydrogen plasma. Several clear observations of the presence of hot electrons have been made in the molecular (ionizing) regime of the expanding plasma. For both regimes the absolute density of atomic hydrogen in the ground state and the degree of plasma dissociation have been determine

Kinetics of atomic hydrogen in an expanding magnetized low-pressure plasma

The abs. d. of at. hydrogen excited states in a magnetized expanding thermal plasma is detd. using emission and absorption spectroscopy. Depending on the conditions a population inversion is obsd. between the quantum states 3 ? p ? 7. It is argued that mol. induced mutual recombination reactions of pos. ions with neg. ions should play an important role on hydrogen at. level population. The abs. population d. of hydrogen in the first excited state and a simple kinetic scheme were used to derive information on the abs. d. of at. hydrogen in the ground state and dissocn. degree of hydrogen plasma. The properties of the charged particles in the plasma have been obtained from single and double Langmuir probe diagnostics. First evidences have been found for the presence of high densities of the neg. ions in an expanding hydrogen plasma. [on SciFinder (R)