Emission from oxygen atoms produced by electron-impact dissociative excitation of oxygen molecules

Schulman, M.B.; Fa, Sharpton; Chung, Sang-Min; Lin, Chia-Chin; Anderson, L. W.

doi:10.1103/physreva.32.2100

Cited by 68 publications

(41 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The thresholds for direct electron-impact excitation of O(3p 3 P) at 10.98 eV and of Ar(2p 1 ) at 13.48 eV differ by 2.5 eV according to the cross-section data [26][27][28]. At atmospheric pressure, however, this small threshold difference has a significant influence on the excitation rate ratio due to considerable variations of the electron energy distribution in this energy range.…”

Section: Oes Measurements In the Discharge Regionmentioning

confidence: 86%

Diagnostic-based modeling on a micro-scale atmospheric-pressure plasma jet

Waskoenig

Niemi

Knake

et al. 2010

Pure and Applied Chemistry

View full text Add to dashboard Cite

Diagnostic-based modeling (DBM) actively combines complementary advantages of numerical plasma simulations and relatively simple optical emission spectroscopy (OES). DBM is applied to determine spatial absolute atomic oxygen ground-state density profiles in a micro atmospheric-pressure plasma jet operated in He-O 2 . A 1D fluid model with semi-kinetic treatment of the electrons yields detailed information on the electron dynamics and the corresponding spatio-temporal electron energy distribution function. Benchmarking this time-and space-resolved simulation with phase-resolved OES (PROES) allows subsequent derivation of effective excitation rates as the basis for DBM. The population dynamics of the upper O(3p 3 P) oxygen state (λ = 844 nm) is governed by direct electron impact excitation, dissociative excitation, radiation losses, and collisional induced quenching. Absolute values for atomic oxygen densities are obtained through tracer comparison with the upper Ar(2p 1 ) state (λ = 750.4 nm). The resulting spatial profile for the absolute atomic oxygen density shows an excellent quantitative agreement to a density profile obtained by two-photon absorption laser-induced fluorescence spectroscopy.

show abstract

Section: Oes Measurements In the Discharge Regionmentioning

confidence: 86%

Diagnostic-based modeling on a micro-scale atmospheric-pressure plasma jet

Waskoenig

Niemi

Knake

et al. 2010

Pure and Applied Chemistry

View full text Add to dashboard Cite

show abstract

“…Apart from the cited paper by Schulman et al (1985) mentioning the cross section of the 4 P-4 D 0 multiplet, the only other paper we are aware of is that by Haasz and deLeeuw (1976). They measured effective emissions cross sections of O + lines at 4350Å and 4416Å.…”

Section: Discussionmentioning

confidence: 99%

“…However, their cross sections were obtained for the energy range of 0.6 to 3.0 keV, and thus cannot be directly compared to our result. It should also be pointed out that our results, as well as those by Haasz and deLeeuw (1976) and Schulman et al (1985), refer to emission cross sections, including cascading from higher lying states, possibly excited by electron impact.…”

Section: Discussionmentioning

confidence: 99%

“…13). The cross section for reaction (2) has been measured by Schulman et al (1985) as a by-product of their work on the neutral oxygen atom emissions produced in electron impact dissociative ionization of O 2 . It was found that the cross section for the two 3s 4 P 1/2,5/2 −3p 4 D 0 1/2,7/2 lines at 4650Å has a maximum at 200 eV, where its value is 0.17×10 −18 cm 2 .…”

Section: Estimation Of the Excitation Cross Sectionsmentioning

confidence: 99%

See 1 more Smart Citation

Observation of O+ (4P-4D0) lines in electron aurora over Svalbard

et al. 2004

View full text Add to dashboard Cite

Abstract. This work reports on observations of O + lines in aurora over Svalbard, Norway. The Spectrographic Imaging Facility measures auroral spectra in three wavelength intervals (H β , N (1,3) band. It is found that in electron aurora, the brightness of this multiplet, is on average, about 0.1 of the N + 2 1N(0,2) total brightness. A joint optical and incoherent scatter radar study of an electron aurora event shows that the ratio is enhanced when the ionisation in the upper E-layer (140-190 km) is significant with respect to the E-layer peak below 130 km. Rayed arcs were observed on one such occasion, whereas on other occasions the auroral intensity was below the threshold of the imager. A one-dimensional electron transport model is used to estimate the cross section for production of the multiplet in electron collisions, yielding 0.18×10 −18 cm 2 .

show abstract

“…37 In this case, the simple assumptions that the threshold energy and the energy dependence of the excitation rates of both excited states are similar does not apply as the electron impact cross section for dissociative excitation is significantly different in shape and magnitude from that due to direct excitation. Various works have extended the basic actinometry approach for atomic oxygen (and atomic hydrogen 38 ) to incorporate the dissociative excitation process.…”

mentioning

confidence: 99%

Investigation of the radially resolved oxygen dissociation degree and local mean electron energy in oxygen plasmas in contact with different surface materials

Tsutsumi

Greb

Gibson

et al. 2017

Journal of Applied Physics

View full text Add to dashboard Cite

Energy Resolved Actinometry is applied to simultaneously measure the radially resolved oxygen dissociation degree and local mean electron energy in a low-pressure capacitively coupled radio-frequency oxygen plasma with an argon tracer gas admixture. For this purpose, the excitation dynamics of three excited states, namely, Ar(2p1), O(3p3P), and O(3p5P), were determined from their optical emission at 750.46 nm, 777.4 nm, and 844.6 nm using Phase Resolved Optical Emission Spectroscopy (PROES). Both copper and silicon dioxide surfaces are studied with respect to their influence on the oxygen dissociation degree, local mean electron energy, and the radial distributions of both quantities and the variation of the two quantities with discharge pressure and driving voltage are detailed. The differences in the measured dissociation degree between different materials are related back to atomic oxygen surface recombination probabilities.

show abstract

Emission from oxygen atoms produced by electron-impact dissociative excitation of oxygen molecules

Cited by 68 publications

References 31 publications

Diagnostic-based modeling on a micro-scale atmospheric-pressure plasma jet

Diagnostic-based modeling on a micro-scale atmospheric-pressure plasma jet

Observation of O<sup>+</sup> (<sup>4</sup>P-<sup>4</sup>D<sup>0</sup>) lines in electron aurora over Svalbard

Investigation of the radially resolved oxygen dissociation degree and local mean electron energy in oxygen plasmas in contact with different surface materials

Contact Info

Product

Resources

About

Emission from oxygen atoms produced by electron-impact dissociative excitation of oxygen molecules

Cited by 68 publications

References 31 publications

Diagnostic-based modeling on a micro-scale atmospheric-pressure plasma jet

Diagnostic-based modeling on a micro-scale atmospheric-pressure plasma jet

Observation of O&lt;sup&gt;+&lt;/sup&gt; (&lt;sup&gt;4&lt;/sup&gt;P-&lt;sup&gt;4&lt;/sup&gt;D&lt;sup&gt;0&lt;/sup&gt;) lines in electron aurora over Svalbard

Investigation of the radially resolved oxygen dissociation degree and local mean electron energy in oxygen plasmas in contact with different surface materials

Contact Info

Product

Resources

About

Observation of O<sup>+</sup> (<sup>4</sup>P-<sup>4</sup>D<sup>0</sup>) lines in electron aurora over Svalbard