Photoionization of Air by Vacuum Ultraviolet

Kashiwagi, Yasuhide; Saeki, Masamori

doi:10.1541/ieejfms1990.117.1_29

Cited by 3 publications

(3 citation statements)

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“…However, the coefficients are much smaller in several narrow wavelength regions called windows. A series of 0.3 cm −1 windows exists at 111, 118 and 121 nm near the Lyman α line, and four windows of 0.5 cm −1 exist in the range from 111-118 nm [8]. Lee [9] also reported an absorption coefficient of 0.24 cm −1 near the Lyman α wavelength.…”

Section: Photoabsorption By O 2 In the Vacuum Uv Regionmentioning

confidence: 95%

“…As absorption by nitrogen is negligible [8], the intensity of light after passing through the air can be calculated easily from the coefficients in figure 8 using the following equation and the mixture ratio of 21 : 79 for oxygen : nitrogen.…”

Section: Photoabsorption By O 2 In the Vacuum Uv Regionmentioning

confidence: 99%

“…After that, NO is composed by the recombination of atomic nitrogen and oxygen. NO is ionized by capturing the same VUV, and electrons are supplied in the space [8,11]. In the case of the 115 nm filter, the light passing through the filter has an energy of approximately 10 eV, which is sufficient to ionize NO in the second electrode system.…”

Section: Photoionization By Vacuum Uv Emissionmentioning

confidence: 99%

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Synchronization of positive surface streamers triggered by vacuum ultraviolet in atmosphere

Kashiwagi

2005

J. Phys. D: Appl. Phys.

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The synchronous generation of the surface streamer discharges from two electrodes in air is investigated in terms of wavelength and intensity of the discharge light as a trigger for the synchronization of the surface streamers. It is found that the light emitted from the first streamer causes the photoelectron emission and the photoionization in the vicinity of the opposing electrode, triggering synchronous discharge of the second streamer. The wavelength of the light contributing to this phenomenon is shorter than 250 nm, with a remarkable rise in synchronization probability from 164 nm to 115 nm. This is considered to be due to the existence of the photoabsorption windows for oxygen in this vacuum ultraviolet region. These results suggest that the photon energy required to supply initial electrons sufficient to trigger the surface streamers on an acrylic resin insulator is at least 5 eV and more enhancement is found at 8 and 10 eV in this study.

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Section: Photoabsorption By O 2 In the Vacuum Uv Regionmentioning

confidence: 95%

Section: Photoabsorption By O 2 In the Vacuum Uv Regionmentioning

confidence: 99%

Section: Photoionization By Vacuum Uv Emissionmentioning

confidence: 99%

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Synchronization of positive surface streamers triggered by vacuum ultraviolet in atmosphere

Kashiwagi

2005

J. Phys. D: Appl. Phys.

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Diffuse Coplanar Surface Barrier Discharge in Artificial Air: Statistical Behaviour of Microdischarges

et al. 2014

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Diffuse Coplanar Surface Barrier Discharge (DCSBD) is a novel type of atmospheric-pressure plasma source developed for high-speed large-area surface plasma treatments. The statistical behavior of microdischarges of DCSBD generated in artificial air atmosphere was studied using time-correlated optical and electrical measurements. Changes in behavior of microdischarges are shown for various electrode gap widths and input voltage amplitudes. They are discussed in the light of correlation of the number of microdischarges and the number of unique microdischarges' paths per discharge event.The 'memory effect' was observed in the behavior of microdischarges and it manifests itself in a significant number of microdischarges reusing the path of microdischarges from previous half-period. Surprisingly this phenomenon was observed even for microdischarges of the same half-period of the discharge, where mechanisms other than charge deposition have to be involved. The phenomenon of discharge paths reuse is most pronounced for wide electrode gap width and/or increased input voltage amplitude.

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Photoionization Current by Vacuum Ultraviolet Light in N<sub>2</sub>/O<sub>2</sub> Mixtures

Suzuki

Ikuta

2004

IEEJ Trans. FM

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Measurement of photoionization current is carried out in N 2 /O 2 mixtures using a gas cell, which is made up an eccentric cylinder electrode. A deuterium discharge lamp with MgF 2 window is used for vacuum ultraviolet source. The photon energy of the VUV is changed by CaF 2 and quartz filters. The photoelectron current emitted from the surface of electrodes is observed in pure N 2 gas. On the contrast, it is confirmed that photoionization current increased in the gas cell with an increase in the partial pressure of O 2 in N 2 /O 2 mixtures. Such current is also found in UV region. These facts prove certain generation processes of charged particles by photo ionization of NO which is formed through the recombination from dissociated O and N atoms by the VUV absorption. However, another result suggests a possibility of a certain charged particle production process through the interaction between N 2 and photodissociated O atom.

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Photoionization of Air by Vacuum Ultraviolet

Cited by 3 publications

References 1 publication

Synchronization of positive surface streamers triggered by vacuum ultraviolet in atmosphere

Synchronization of positive surface streamers triggered by vacuum ultraviolet in atmosphere

Diffuse Coplanar Surface Barrier Discharge in Artificial Air: Statistical Behaviour of Microdischarges

Photoionization Current by Vacuum Ultraviolet Light in N<sub>2</sub>/O<sub>2</sub> Mixtures

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