Recombination of electrons and ions in an atmospheric argon plasma

Desai, S.V.; Corcoran, W. H.

doi:10.1016/0022-4073(69)90122-8

Cited by 36 publications

(7 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…For the radiation loss, the net emission coefficient at the electron temperature for an optically thin plasma is used and it is calculated based on the technique implemented by Gleizes et al [32]. The ambipolar diffusion and recombination rate coefficients are taken from [33] and [34], respectively.…”

Section: B Materials Propertiesmentioning

confidence: 99%

Transient Behavior of Current Modulated 2-T Inductively Coupled Plasma

Paul

2004

IEEE Trans. Plasma Sci.

View full text Add to dashboard Cite

Time-dependent thermal plasmas are not in an equilibrium condition even if they are operated at a very high pressure. Therefore, nonequilibrium modeling is required in order to understand the underlying physics. Unfortunately, substantial modeling complexities have prevented significant advancements in the state-of-the-art. This paper presents new information for the nonequilibrium situation where the electron temperature is generally assumed to be higher than the heavy particle or gas temperature. Calculations are done for a radio-frequency inductively coupled thermal plasma where the coil current is pulse modulated. The discharge medium is argon at one atmosphere of pressure. The high-level current (representing the on-time state) is 170 A and is reduced to 80% of the high-level current or 136 A during the off-time state. The on-time and off-time durations are 10 and 5 ms, respectively. The electron temperature is observed to be higher by a factor of two or three compared to the gas temperature in the cooler region of the discharge. The difference between electron and heavy-particle temperature is negligible in the plasma core. The temporal behavior of the electron and heavy-particle temperatures are similar during the off-time, whereas the electron temperature's response is much faster than that of the heavy particle during the on-time. The response of the electron temperature to a step change in input power is almost instantaneous and enhances the energy exchange mechanism through elastic collisions between electron and heavy particles.Index Terms-Chemical nonequilibrium, duty factor, kinetic nonequilibrium, local thermodynamic equilibrium (LTE), response time, simmer current level (SCL). Khokan C. Paul (M'99) received the B.Sc. degree in electrical and electronic engineering from Bangladesh Institute of Technology, Chittagong, Bangladesh, in 1990, and the M. Eng. and Ph.D. degrees from the

show abstract

Section: B Materials Propertiesmentioning

confidence: 99%

Transient Behavior of Current Modulated 2-T Inductively Coupled Plasma

Paul

2004

IEEE Trans. Plasma Sci.

View full text Add to dashboard Cite

show abstract

“…La valeur proposte par Desai et Corcoran est plus faible que celle proposCe par les autres auteurs. Cependant, la densitt tlectronique ne mesurte est inftrieure de trois ordres de grandeur 8. celle qui correspondrait 8. un ttat d'tquilibre 8. la tcmptrature de 10 350 K. Ainsi, la valeur de cy donnee par Desai et Corcoran (1969), pour une recom- (1969) nous constatons que pour les faibles valeurs de T, nos valeurs de 01 sont en bon accord avec celles donnCes par le calcul. Pour T > 10 000 K, nos valeurs sont infkrieures aux valeurs thkoriques.…”

Section: Coefficient Apparent De Recombinaisonunclassified

Spectroscopic study during the extinction of an electric arc

Kafrouni¹,

Vacquié²

1977

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

show abstract

“…13 These experience various interferences, including self-absorption of atomic emission lines, 13 selective ionization of elements 15 and molecular recombinations. 18 To exclude the external fringe from the optic path, various water-cooled metal skimmers or cones with smalldiameter viewing apertures are positioned to minimise plasma interferences and protect the optics from direct heat. These cones or the use of a 90 shear gas system reduce the recombination interferences that occur in the tail zone of the plasma.…”

Section: Introductionmentioning

confidence: 99%

Chloride analysis of botanical samples by ICP-OES

Wheal

Palmer

2010

J. Anal. At. Spectrom.

View full text Add to dashboard Cite

A unique method for chloride analysis of botanical samples by axially viewed ICP-OES with a modified optical system is described. Calibration on the most sensitive wavelength (134.7 nm) between 1 and 200 mg Cl L À1 yielded a curvilinear relationship (R 2 ¼ 1.000) across three orders of magnitude. The instrumental limits of detection in solution of 0.041 mg L À1 and background equivalent concentration of 5.29 mg L À1 are similar to those of other methods using pneumatic nebulisers. Matrix matching of calibration standards with respect to nitric acid concentration (4% v/v) and carbon levels (0.15% sucrose m/v) of extracted sample solutions produced consistent responses from plant material. High carbon concentrations (up to 8% sucrose m/v) caused matrix interferences that decreased blank values by 4.5 mg L À1 and suppressed Cl signals by 20%. No interferences from countercations were observed. A simple extraction process for dried plant samples (0.1 g in 40 mL of 4% HNO 3 ) was developed and tested with plant standard reference materials. Recovery of Cl from the majority of materials was close to 100% of established values while relative standard deviations were below 4% except when chloride concentration was close to the method detection limit. The extraction method was robust to modifications for samples with low mass or high Cl concentrations.

show abstract

Recombination of electrons and ions in an atmospheric argon plasma

Cited by 36 publications

References 14 publications

Transient Behavior of Current Modulated 2-T Inductively Coupled Plasma

Transient Behavior of Current Modulated 2-T Inductively Coupled Plasma

Spectroscopic study during the extinction of an electric arc

Chloride analysis of botanical samples by ICP-OES

Contact Info

Product

Resources

About