Experimental and theoretical investigation of oxygen glow discharge structure at low pressures

Ivanov, V. V.; Klopovsky, K. S.; Lopaev, Dmitry; Rakhimov, A. T.; Рахимова, Т. В.

doi:10.1109/27.799804

Cited by 60 publications

(77 citation statements)

References 21 publications

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“…Appropriate models of the H-form were presented e.g. in [16,17,4], but a model of the T-form is still lacking, presumably because of its inutility and lack of experimental data. However, the observed difference in the relative intensity ratio I 777 /I 845 seems to be an applicable and repeatable parameter to distinguish both particular forms.…”

Section: Resultsmentioning

confidence: 99%

T- and H- forms of dc oxygen discharge at medium pressures: spectroscopic study

et al. 2014

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Abstract:The active DC glow discharge sustained in the pure oxygen can be employed in various technological applications, such as thin layer deposition or sterilization. Considering applied pressures of hundreds of Pascals, two different forms of the positive column of the discharge can co-exist: T-and H-form. These forms are commonly distinguished according to the values of the axial electric field strength: values in the H-form are generally one order of magnitude higher compared to the T-form. However, electric measurement itself may often affect the discharge plasma. Optical emission spectroscopy as a non-invasive diagnostic was therefore employed as an alternate characterization of both forms.We found that the H-and T-forms can be clearly recognized by values of intensities of particular oxygen spectral lines. This characterization enabled us to observe transition between the both particular forms when spatial distribution measurements were employed. Moreover, transition in the rotational temperature Trot was also observed.

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Section: Resultsmentioning

confidence: 99%

T- and H- forms of dc oxygen discharge at medium pressures: spectroscopic study

et al. 2014

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“…and many others, the baseline yield of 02('Ei) is taken to be 16% and O2(') is taken as 2% of the flow. Based upon GlobalKin output and experimental data by Ivanov [Ivanov, 1999], the concentration of 0 atoms is taken to be the same as 0 2(t). The pressure of the flow is 1 .94 Torn Thermocouple and spectroscopic temperature measurements of the 02 flow indicate a temperature of approximately 340 K at the point of iodine injection.…”

Section: Subsonic Studies With Single Iodine Jetmentioning

confidence: 99%

<title>Recent work on the development of an electric-discharge oxygen-iodine laser</title>

et al. 2003

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Theoretical studies have indicated that sufficient fractions of O2('i) may be produced in an electrical discharge that will permit lasing of an electric discharge oxygen-iodine laser (ElectriCOIL) system in conjunction with injection of pre-dissociated iodine. Results of those studies along with more recent experimental results show that electric excitation is a very complicated process that must be investigated with advanced diagnostics along with modeling to better understand this highly complex system. In this paper, recent work in the development of the ElectriCOlL system is discussed. A kinetic package appropriate for the ElectriCOlL system is presented and implemented in the detailed electrodynamic GlobalKin model and the Blaze II laser modeling code. A parametric study with the Blaze II model establishes that it should be possible to attain positive gain in the ElectriCOIL system, even with subsonic flow. The Blaze II model is in reasonable agreement with early gain data. Temperature is a critical flow variable, especially in the subsonic cases. Simulations of a supersonic ElectriCOlL system indicate that significant performance levels can be attained, even at low yield levels of 20% or less. In addition, pre-dissociation of the iodine is also shown to be very important for the supersonic flow situation. Given the critical nature of the temperature issue, it appears that supersonic flow will be required for the ElectriCOlL system to achieve significant performance levels, but these simulations also indicate that it should be possible to demonstrate a subsonic system.

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“…The properties of the electronegative plasma depend on electronegativity nn/ne and a whole series of other parameters. The theoretical and experimental studies of dc discharges and slightly less rf discharges show that the discharges in electronegative gases are structured with an ion-ion core and an outer electron-positive ion plasma [2,3]. The electron attachment effects on property of the transient discharges quickly changing their characteristics in space and time as, for example, the dielectric barrier discharges (DBD) are much less studied.…”

Section: Introductionmentioning

confidence: 99%

On electron attachment effect on characteristics of the DBD in chlorine and its mixtures with xenon

Avtaeva

2017

J. Phys.: Conf. Ser.

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Abstract. The electron attachment effect on DBD characteristics in chlorine and its mixtures with xenon has been studied. Characteristics of the DBDs in pure chlorine and in xenonchlorine mixtures with a chlorine fraction of 0.1-5% were modeled using the fluid model. It is shown that the electron attachment limits a magnitude of the DBD current, contributes to formation of multiple current spikes, appearance of a double layer near the dielectric surface and formation of XeCl * excimer molecules, and leads to a redistribution of the power deposited into the discharge: more power is deposited into ions and less power is deposited into electrons. IntroductionThe electron attachment in plasma of electronegative gases and their mixtures with electropositive gases made the plasma properties very different from that of electropositive plasma [1]. The properties of the electronegative plasma depend on electronegativity nn/ne and a whole series of other parameters. The theoretical and experimental studies of dc discharges and slightly less rf discharges show that the discharges in electronegative gases are structured with an ion-ion core and an outer electron-positive ion plasma [2,3]. The electron attachment effects on property of the transient discharges quickly changing their characteristics in space and time as, for example, the dielectric barrier discharges (DBD) are much less studied. DBDs in inert gas-halide mixtures are widely used in excilamps to generate VUV radiation [4,5] and can be applied for diverse surface treatment. The future development of the DBD plasma sources will depend on a better understanding the underlying physics. There we present some finding on the electron attachment effect on properties the DBD in Xe-Cl2 mixtures and in pure chlorine, which are revealed at fluid modeling of the discharges.

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Experimental and theoretical investigation of oxygen glow discharge structure at low pressures

Cited by 60 publications

References 21 publications

T- and H- forms of dc oxygen discharge at medium pressures: spectroscopic study

T- and H- forms of dc oxygen discharge at medium pressures: spectroscopic study

<title>Recent work on the development of an electric-discharge oxygen-iodine laser</title>

On electron attachment effect on characteristics of the DBD in chlorine and its mixtures with xenon

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