Spectral quantum yield of metallic and nonmetallic photocathodes in the 95-20nm region

Kulikov, S.; Mishchenko, E. D.; Никитин, В. Г.; Startsev, G. P.

doi:10.1007/bf00653878

Cited by 2 publications

(1 citation statement)

References 14 publications

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“…These particles hitting the probe surface make it emit electrons which will lead to a distortion of the ion part of the probe characteristic and an increase in the measured wall current. Under the investigated conditions, the flux of secondary electrons is determined by the quantum yield of probe materials [59], as well as by the density of metastable and resonance states. When constructing a theory that would allow comparing the theoretical wall currents with the results of the experimental study, it would be necessary to take into account the contribution of the secondary electron flux in the total value of the particle flux density.…”

Section: Experiments On the Measurement Of The Wall Currentsmentioning

confidence: 99%

The role of recombination in constriction of a positive column of a glow discharge in inert gases

Siasko,

Karasev,

Golubovskii

2023

Plasma Sources Sci. Technol.

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The work is aimed at the experimental determination of the role of volume recombination in a positive column of a DC discharge in helium during the transition from a diffuse homogeneous state to a constricted stratified regime under real discharge conditions of high electron and gas temperatures (Te ≈ 2 eV, Tg > 1000 K). The investigation is based on the probe measurements of the wall current determined by the flux of charged particles towards the boundary of a cylindrical discharge tube. The experiments were carried out in helium, neon, and argon in the range of reduced pressures 1.2 - 300 Torr·cm. In heavy inert gases, the transition to a constricted regime is determined by the active loss of charged particles in the volume. In contrast to neon and argon, experiments in helium demonstrated that the role of volume recombination is insignificant during the transition to a constricted regime. The rate of volume losses in helium in real conditions is very low compared to neon and argon. The obtained results allow one to calculate the volume recombination rate by comparing the experimentally measured wall currents with the corresponding numerical calculations within the collision-radiative model.

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Section: Experiments On the Measurement Of The Wall Currentsmentioning

confidence: 99%

The role of recombination in constriction of a positive column of a glow discharge in inert gases

Siasko,

Karasev,

Golubovskii

2023

Plasma Sources Sci. Technol.

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Residual currents detected with a correcting electrode in a modified Bayard–Alpert hot-cathode-ionization gauge

Saeki

Magome

2008

Review of Scientific Instruments

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A nude-type hot-cathode-ionization-gauge head with correcting electrode and shield tube, succeeded in reducing practical pressure-measurement errors caused by an influx of photoelectrons in a synchrotron radiation environment. In the development of this modified Bayard-Alpert hot-cathode-ionization gauge, experimental results showed that a basic ion current generated around the correcting electrode by emission from the gauge filament, was proportional to an emission current (less than 10% of the normal emission current) detected with a grid of correcting electrode, and that differences between estimated and measured basic ion currents in a pressure range of higher than 10(-8) Pa order meant pressure-independent residual currents detected with the correcting electrode. By using calculated forward x-ray currents, these results also showed that the estimated residual currents with the correcting electrode were mainly caused by x rays from the grid of the hot-cathode-ionization-gauge head and the grid of correcting electrode, and that the x-ray currents with the correcting electrode only caused by x rays from the grid of the hot-cathode-ionization-gauge head were about 11% of the nominal x-ray current of the ionization-gauge head. Furthermore, they may suggest that an expected residual current with the collector can be calculated by using the estimated residual current with the correcting electrode, and that this ionization gauge has an additional function to reduce pressure-measurement errors caused by residual currents, though it is necessary to test the ionization gauge in an extremely high-vacuum environment under the x-ray limit of the gauge.

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Spectral quantum yield of metallic and nonmetallic photocathodes in the 95-20nm region

Cited by 2 publications

References 14 publications

The role of recombination in constriction of a positive column of a glow discharge in inert gases

The role of recombination in constriction of a positive column of a glow discharge in inert gases

Residual currents detected with a correcting electrode in a modified Bayard–Alpert hot-cathode-ionization gauge

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