Resonant energy transfer from argon dimers to atomic oxygen in microhollow cathode discharges

Moselhy, M.; Stark, R.H.; Schoenbach, K.H.; Kogelschatz, U.

doi:10.1063/1.1336547

Cited by 52 publications

(41 citation statements)

References 7 publications

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“…The reported lifetimes are τ singlet =6 ns and τ triplet =2.86 μs for Ar 2 * ( 1 Σ u + ) [48] and Ar 2 * ( 3 Σ u + ) [23], respectively. Due to the long lifetime of the latter, resonant quenching of the excimer by O I, N I, and H I is enhanced as, e.g., described for oxygen by Moselhy et al [49]. The spectra in Figure 4c with 0.5% and 1.0% air present in 1000 mbar of Argon clearly demonstrate the quenching effect of small amounts of impurities.…”

Section: Optical Emission Spectroscopy (Oes)mentioning

confidence: 55%

A Novel APPI-MS Setup for In Situ Degradation Product Studies of Atmospherically Relevant Compounds: Capillary Atmospheric Pressure Photo Ionization (cAPPI)

Kersten

Derpmann

Barnes

et al. 2011

J. Am. Soc. Mass Spectrom.

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We report on the development of a novel atmospheric pressure photoionization setup and its applicability for in situ degradation product studies of atmospherically relevant compounds. A custom miniature spark discharge lamp was embedded into an ion transfer capillary, which separates the atmospheric pressure from the low pressure region in the first differential pumping stage of a conventional atmospheric pressure ionization mass spectrometer. The lamp operates with a continuous argon flow and produces intense light emissions in the VUV. The custom lamp is operated windowless and efficiently illuminates the sample flow through the transfer capillary on an area smaller than 1 mm 2 . Limits of detection in the lower ppbV range, a temporal resolution of milliseconds in the positive as well as the quasi simultaneously operating negative ion mode, and a significant reduction of ion transformation processes render this system applicable to real time studies of rapidly changing chemical systems. The method termed capillary atmospheric pressure photo ionization (cAPPI) is characterized with respect to the lamp emission properties as a function of the operating conditions, temporal response, and its applicability for in situ degradation product studies of atmospherically relevant compounds, respectively.

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Section: Optical Emission Spectroscopy (Oes)mentioning

confidence: 55%

A Novel APPI-MS Setup for In Situ Degradation Product Studies of Atmospherically Relevant Compounds: Capillary Atmospheric Pressure Photo Ionization (cAPPI)

Kersten

Derpmann

Barnes

et al. 2011

J. Am. Soc. Mass Spectrom.

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“…Even still, minor contribution from the oxygen impurity is still present. It is possible that this oxygen is a product of ablation and evaporation processes on the Al 2 O 3 dielectric, as is suggested by Moselhy et al [9].…”

Section: Methodsmentioning

confidence: 80%

Optimizing drive parameters of a nanosecond, repetitively pulsed microdischarge high power 121.6 nm source

Stephens

Fierro

Trienekens

et al. 2014

Plasma Sources Sci. Technol.

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Utilizing nanosecond high voltage pulses to drive microdischarges (MDs) at repetition rates in the vicinity of 1 MHz previously enabled increased time-averaged power deposition, peak vacuum ultraviolet (VUV) power yield, as well as time-averaged VUV power yield. Here, various pulse widths (30-250 ns), and pulse repetition rates (100 kHz-5 MHz) are utilized, and the resulting VUV yield is reported. It was observed that the use of a 50 ns pulse width, at a repetition rate of 100 kHz, provided 62 W peak VUV power and 310 mW time-averaged VUV power, with a time-averaged VUV generation efficiency of ∼1.1%. Optimization of the driving parameters resulted in 1-2 orders of magnitude increase in peak and time-averaged power when compared to low power, dc-driven MDs.

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“…Previously, spectral emissions attributed to excited Ar 2 and Ar 2 + dimers in a pure Ar gas discharge have been reported in spectral regions around 110, 130, 155, 190, and 213 nm [9,10,11]. Furthermore, possible energy transfer to O 2 from excited Ar 2 dimer [12] as well as Ar + ions and excited Ar have been discussed [13]. In some cases, the disappearance of continuum emission from Ar 2 * and Ar ++ with the addition of another gas was also reported [9,14].…”

Section: Energy Transfer Between Ar and O2 In An Ar-o2 Gas Mixturementioning

confidence: 98%

Optical emission characteristics of glow discharges in Ar-O2 and He-O2 gas mixtures

Aljalal

Khan

2006

Czech J Phys

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We have investigated optical emissions from low-pressure DC glow discharges in Ar-O 2 and He-O2 gas mixtures in the 300 to 850 nm spectral range. The ionic species present in these discharges reveal interesting energy transfer pathways between different constituents of the gas mixtures. In the case of Ar-O2 mixture, we observed the presence of highly excited Ar and O atoms as well as Ar + , Ar 2 + and O 2 + ions. Apparently, charge-exchange collisions between Ar 2 + and O 2 yield O 2 + ions. The path ways of energy transfer are different for He-O2 gas mixture where O2 + ions are formed directly through collisions with excited He atoms. The O 2 + ions subsequently capture free electrons and dissociate into excited O atoms. PACS : 52.25.Os, 52.20.Hv, 52.80.Hc

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Resonant energy transfer from argon dimers to atomic oxygen in microhollow cathode discharges

Abstract: Articles you may be interested in A global model of the self-pulsing regime of micro-hollow cathode discharges

Cited by 52 publications

References 7 publications

A Novel APPI-MS Setup for In Situ Degradation Product Studies of Atmospherically Relevant Compounds: Capillary Atmospheric Pressure Photo Ionization (cAPPI)

A Novel APPI-MS Setup for In Situ Degradation Product Studies of Atmospherically Relevant Compounds: Capillary Atmospheric Pressure Photo Ionization (cAPPI)

Optimizing drive parameters of a nanosecond, repetitively pulsed microdischarge high power 121.6 nm source

Optical emission characteristics of glow discharges in Ar-O2 and He-O2 gas mixtures

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