Academic Journal
Singlet oxygen generation in a high pressure non-self-sustained electric discharge.
| Τίτλος: | Singlet oxygen generation in a high pressure non-self-sustained electric discharge. |
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| Συγγραφείς: | Adam AH Hicks, Seth SN Norberg, Paul PS Shawcross, Walter WRL Lempert, J JWR Rich, Igor IVA Adamovich |
| Πηγή: | Journal of Physics D: Applied Physics; Oct2005, Vol. 38 Issue 20, p3812-3824, 13p |
| Περίληψη: | This paper presents results of singlet oxygen generation experiments in a high-pressure, non-self-sustained crossed discharge. The discharge consists of a high-voltage, short pulse duration, high repetition rate pulsed discharge, which produces ionization in the flow, and a low-voltage dc discharge which sustains current in a decaying plasma between the pulses. The sustainer voltage can be independently varied to maximize the energy input into electron impact excitation of singlet delta oxygen (SDO). The results demonstrate operation of a stable and diffuse crossed discharge in O2–He mixtures at static pressures of at least up to P0 = 380 Torr and sustainer discharge powers of at least up to 1200 W, achieved at P0 = 120 Torr. The reduced electric field in the positive column of the sustainer discharge varies from E/N = 0.3 10−16 to 0.65 10−16 V cm2, which is significantly lower than E/N in self-sustained discharges and close to the theoretically predicted optimum value for O2(a 1Δ) excitation. Measurements of visible emission spectra O2(b 1Σ → X 3Σ) in the discharge afterglow show the O2(b 1Σ) concentration to increase with the sustainer discharge power and to decrease as the O2 fraction in the flow is increased. Rotational temperatures inferred from these spectra in 10% O2–90% He flows at P0 = 120 Torr and mass flow rates of are 365–465 K. SDO yield at these conditions, 1.7% to 4.4%, was inferred from the integrated intensity of the (0, 0) band of the O2(a 1Δ → X 3Σ) infrared emission spectra calibrated using a blackbody source. The yield remains nearly constant in the discharge afterglow, up to at least 15 cm distance from the discharge. Kinetic modelling calculations using a quasi-one-dimensional nonequilibrium pulser–sustainer discharge model coupled with the Boltzmann equation for plasma electrons predict gas temperature rise in the discharge in satisfactory agreement with the experimental measurements. However, the model overpredicts the O2(a 1Δ) yield by a factor of 2–2.5, which suggests that the model''s description of nonequilibrium O2–He plasma kinetics at high pressures is not quite adequate. [ABSTRACT FROM AUTHOR] |
| Copyright of Journal of Physics D: Applied Physics is the property of IOP Publishing and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Βάση Δεδομένων: | Complementary Index |
| FullText | Text: Availability: 0 |
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| Header | DbId: edb DbLabel: Complementary Index An: 20127339 RelevancyScore: 832 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 832.355651855469 |
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| Items | – Name: Title Label: Title Group: Ti Data: Singlet oxygen generation in a high pressure non-self-sustained electric discharge. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Adam+AH+Hicks%22">Adam AH Hicks</searchLink><br /><searchLink fieldCode="AR" term="%22Seth+SN+Norberg%22">Seth SN Norberg</searchLink><br /><searchLink fieldCode="AR" term="%22Paul+PS+Shawcross%22">Paul PS Shawcross</searchLink><br /><searchLink fieldCode="AR" term="%22Walter+WRL+Lempert%22">Walter WRL Lempert</searchLink><br /><searchLink fieldCode="AR" term="%22J+JWR+Rich%22">J JWR Rich</searchLink><br /><searchLink fieldCode="AR" term="%22Igor+IVA+Adamovich%22">Igor IVA Adamovich</searchLink> – Name: TitleSource Label: Source Group: Src Data: Journal of Physics D: Applied Physics; Oct2005, Vol. 38 Issue 20, p3812-3824, 13p – Name: Abstract Label: Abstract Group: Ab Data: This paper presents results of singlet oxygen generation experiments in a high-pressure, non-self-sustained crossed discharge. The discharge consists of a high-voltage, short pulse duration, high repetition rate pulsed discharge, which produces ionization in the flow, and a low-voltage dc discharge which sustains current in a decaying plasma between the pulses. The sustainer voltage can be independently varied to maximize the energy input into electron impact excitation of singlet delta oxygen (SDO). The results demonstrate operation of a stable and diffuse crossed discharge in O2–He mixtures at static pressures of at least up to P0 = 380 Torr and sustainer discharge powers of at least up to 1200 W, achieved at P0 = 120 Torr. The reduced electric field in the positive column of the sustainer discharge varies from E/N = 0.3 10−16 to 0.65 10−16 V cm2, which is significantly lower than E/N in self-sustained discharges and close to the theoretically predicted optimum value for O2(a 1Δ) excitation. Measurements of visible emission spectra O2(b 1Σ → X 3Σ) in the discharge afterglow show the O2(b 1Σ) concentration to increase with the sustainer discharge power and to decrease as the O2 fraction in the flow is increased. Rotational temperatures inferred from these spectra in 10% O2–90% He flows at P0 = 120 Torr and mass flow rates of are 365–465 K. SDO yield at these conditions, 1.7% to 4.4%, was inferred from the integrated intensity of the (0, 0) band of the O2(a 1Δ → X 3Σ) infrared emission spectra calibrated using a blackbody source. The yield remains nearly constant in the discharge afterglow, up to at least 15 cm distance from the discharge. Kinetic modelling calculations using a quasi-one-dimensional nonequilibrium pulser–sustainer discharge model coupled with the Boltzmann equation for plasma electrons predict gas temperature rise in the discharge in satisfactory agreement with the experimental measurements. However, the model overpredicts the O2(a 1Δ) yield by a factor of 2–2.5, which suggests that the model''s description of nonequilibrium O2–He plasma kinetics at high pressures is not quite adequate. [ABSTRACT FROM AUTHOR] – Name: Abstract Label: Group: Ab Data: <i>Copyright of Journal of Physics D: Applied Physics is the property of IOP Publishing and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1088/0022-3727/38/20/007 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 13 StartPage: 3812 Titles: – TitleFull: Singlet oxygen generation in a high pressure non-self-sustained electric discharge. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Adam AH Hicks – PersonEntity: Name: NameFull: Seth SN Norberg – PersonEntity: Name: NameFull: Paul PS Shawcross – PersonEntity: Name: NameFull: Walter WRL Lempert – PersonEntity: Name: NameFull: J JWR Rich – PersonEntity: Name: NameFull: Igor IVA Adamovich IsPartOfRelationships: – BibEntity: Dates: – D: 21 M: 10 Text: Oct2005 Type: published Y: 2005 Identifiers: – Type: issn-print Value: 00223727 Numbering: – Type: volume Value: 38 – Type: issue Value: 20 Titles: – TitleFull: Journal of Physics D: Applied Physics Type: main |
| ResultId | 1 |