Gas temperatures and Penning collision rates in hollow-cathode metal-ion lasers

Ainsworth, M. D.; McIntosh, A I

doi:10.1088/0022-3727/21/8/009

Cited by 2 publications

(1 citation statement)

References 24 publications

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“…[41]). For the gastemperature measurements, the well developed technique was used based on a spectroscopic study of relative intensities of rotational lines of the 3914 Å N + 2 band (B 2 + u -X 2 + g ) (see [42] for a detailed description). Pure He gas was continuously flowed (at ∼0.3 sccm) through the system, and the amount of added N 2 was controlled by a Balzers mass spectrometer (QMS 200) using the Quadstar 421 software.…”

Section: Experimental and Theoretical Results And Discussionmentioning

confidence: 99%

Model of the cathode region and gas temperature of a dc glow discharge at high current density

Arslanbekov¹

2000

J. Phys. D: Appl. Phys.

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A model is reported of the cathode region of a dc glow discharge at high current density. The distributions of most important plasma species (such as fast electrons, fast neutrals and ions, and energetic sputtered metal atoms) are determined either analytically or using simple semi-analytic methods, taking into account possible strong gas-density/temperature gradients. A heat-transfer equation is used to calculate the gas temperature, and the power-deposition profiles due to fast neutrals and energetic metal atoms are determined at the kinetic level. For the conditions of interest, the power-deposition profiles are shown to be strongly non-local and the assumption of Joule (local) heating to be generally inappropriate. Fast neutrals reflected from the cathode, as well as fast recoil neutrals, are shown to play a key role in determining the rate and spatial distribution of gas heating. Spectroscopic measurements of the gas temperature in a hollow-cathode discharge are carried out over a wide range of discharge conditions. The experimental and predicted gas temperatures are compared and acceptable agreement is found. A strong sensitivity of the model predictions to the assumed particle-surface interaction data is observed. The model can be readily adapted to other types of glow discharge and other geometries. It is computationally efficient and can be useful for fast self-consistent modelling of glow-discharge plasmas.

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Section: Experimental and Theoretical Results And Discussionmentioning

confidence: 99%

Model of the cathode region and gas temperature of a dc glow discharge at high current density

Arslanbekov¹

2000

J. Phys. D: Appl. Phys.

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The dominant pumping mechanism of the 441.6 nm Cd II line in a three-colour hollow-cathode discharge laser

Kalinchenko

Иванов

Sém

et al. 1998

J. Phys. D: Appl. Phys.

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The three most probable processes for pumping of the upper lasing level of the 441.6 nm Cd II line under hollow-cathode discharge conditions, namely Penning ionization, 'direct' and 'stepwise' electron excitation, have been analysed. Atomic ionization and excitation cross sections and the electron distribution function in the energy interval up to 300 eV have been calculated. Radial dependencies of pumping rates of laser transition for a cylindrical cathode cavity and an integral pumping rate have been determined versus the cadmium vapour and helium pressures. It has been shown that the contributions of Penning ionization and direct and stepwise excitations to the pumping rate are strongly dependent on the pressures of discharge components. Contributions of these processes are found to reach up to about 70, 30 and less than 1%, respectively, under optimal conditions for the laser discharge. The comparison of calculated radial pumping rate distributions with experimental data confirmed that the Penning ionization plays the dominant role.

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Gas temperatures and Penning collision rates in hollow-cathode metal-ion lasers

Cited by 2 publications

References 24 publications

Model of the cathode region and gas temperature of a dc glow discharge at high current density

Model of the cathode region and gas temperature of a dc glow discharge at high current density

The dominant pumping mechanism of the 441.6 nm Cd II line in a three-colour hollow-cathode discharge laser

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