Energy distributions of cathode fall ions in the light of Boltzmann equation

Wroński, Z.

doi:10.1016/0042-207x(90)90097-i

Cited by 13 publications

(7 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[31][32][33][34] For hydrogen discharges, the model must deal with three positive ions H + , H 2 + , and H 3 + and two fast neutral specie: H atoms and H 2 molecules formed from charge exchange. All these models emphasize the complexity of the discharges resulting from the presence of the multispecie ions.…”

Section: A Velocity Distribution Of H + H 2 + and H 3 +mentioning

confidence: 99%

Signature of fast H atoms from cathode glow region of a dc discharge

et al. 2009

View full text Add to dashboard Cite

Asymmetric broadening of H ␣ line from cathode glow region has been studied. In the cathode glow, mean energy and fractional population of very fast hydrogen atoms were found to be ϳ130 eV and ϳ55%, respectively. These values reduced to ϳ90 eV and ϳ20% when measured at negative glow region. The observed asymmetry was attributed to the presence of the fast hydrogen atoms near the cathode surface. The mean energy and number density of excited fast hydrogen atoms were estimated from the velocity distribution of H + , H 2 + , and H 3 + considering collisions inside the cathode sheath. The reduction in the mean energy and number density of the excited fast hydrogen atoms, at the other locations of the discharge, was explained by energy relaxation and thermalization of the neutrals with the background gas.

show abstract

Section: A Velocity Distribution Of H + H 2 + and H 3 +mentioning

confidence: 99%

Signature of fast H atoms from cathode glow region of a dc discharge

et al. 2009

View full text Add to dashboard Cite

show abstract

“…In 1989, Z. Wroński [27], taking into account the ions motion, solved the Boltzmann equation for the ions generated in the cathode fall of an abnormal glow discharge. The solution gives an axial potential distribution, from which the E-field distribution is obtained.…”

Section: Theoretical Aspectsmentioning

confidence: 99%

“…This works pretends to be a first approach to the discharge modelling, therefore the chosen models present basic physical presumptions. The theories used here are described in the papers by W. D. Davis and T. A. Vanderslice [25], J. Rickards [26] and Z. Wroński [27]. All of them are focused on providing the energy of the ions bombarding the cathode in a glow discharge.…”

Section: Introductionmentioning

confidence: 99%

Application of classical models to high resolution electric field strength falls in a hydrogen glow-discharge

Gonzalez-Fernandez

Steiger

Grützmacher

et al. 2020

Spectrochimica Acta Part B: Atomic Spectroscopy

View full text Add to dashboard Cite

“…The obtained axial distributions of the electric field strength in pure helium are used to calculate the mean free paths of the ~e + ions generated in symmetrical charge exchange processes and their mean energy distributions in the CFR. For this purpose, the theory of Wronski [28] is applied, the basics of which are given in detail in [17,19]. The results of these calculations, i.e.…”

Section: Discharge In Pure Helium and In A Helium-hydrogen Mixturementioning

confidence: 99%

“…16. By applying the theory of Wronski [28], the spatial distributions of ~e ' ion mean energies in the CFR of pure helium discharge are obtained, see Fig. 17.…”

Section: C4-258mentioning

confidence: 99%

Emission Spectroscopy of the Cathode Fall Region of an Analytical Glow Discharge

1997

View full text Add to dashboard Cite

Stark spectroscopy of hydrogen Balmer lines and neutrai helium lines with forbidden components is used for the study of an analyticai glow discharge. Splitting of the hydrogen Hβ and Hγ lines is applied for simultaneous determination of local electric field and temperature of excited H atoms in pure hydrogen and in argon-hydrogen mixture. Temperature measurements showed that, in pure hydrogen discharge, at least two groups of excited atoms exist : "slow", with average energies in the range from 3.4 eV to 8.2 eV and "fast", ranging between 80 eV and 190 eV. In argon-hydrogen discharge, excited hydrogen neutrals with average energies between 32 eV and 43 eV are detected only. The origin of these energetic neutrals is related to the presence of H+ and H3+ : ions in pure hydrogen, and to the dominant role of H3+ ion in argon-hydrogen mixture. For both gases, in the negative glow region, the increase of the exited hydrogen atoms temperature is detected and explanation suggested. For the electric field measurements in pure helium and helium-hydrogen mixture, the Stark splitting and shitiig of the neutral helium 492.19 nm, 447.15 nm and 406.62 nm with respect to their forbidden counterparts is used. Good agreement between electric field measurements from these three helium lies is obtained

show abstract

Energy distributions of cathode fall ions in the light of Boltzmann equation

Cited by 13 publications

References 9 publications

Signature of fast H atoms from cathode glow region of a dc discharge

Signature of fast H atoms from cathode glow region of a dc discharge

Application of classical models to high resolution electric field strength falls in a hydrogen glow-discharge

Emission Spectroscopy of the Cathode Fall Region of an Analytical Glow Discharge

Contact Info

Product

Resources

About