State-selective radiative recombination cross sections of argon ions

2012 ◽  
Vol 113 (15) ◽  
pp. 1920-1927
Author(s):  
C.Y. Li ◽  
Y.Z. Qu ◽  
J.G. Wang
Keyword(s):  
Cross Sections ◽  
Radiative Recombination ◽  
Argon Ions

Gaseous and surface reactions involving helium metastable atoms and resonance photons

1957 ◽  
Vol 241 (1225) ◽  
pp. 270-282 ◽  
Keyword(s):  
Cross Sections ◽  
Gold Surface ◽  
Target Atom ◽  
Photon Flux ◽  
Total Cross Sections ◽  
Metastable Helium ◽  
Helium Atoms ◽  
Atom Flux ◽  
Collision Chamber ◽  
Argon Ions

The absolute electron yield ( γ M ) for He (2 3 S ) metastable atoms incident on a gold surface has been measured. The method requires passage of a metastable atom flux through a collision chamber containing argon and thence to the gold surface. From observations on the current of argon ions arising from collisions of the type He (2 3 S ) + A → He + A + + e , together with measurements of the electron emission from the gold surface, γ M may be determined. The total cross-sections for collisions between metastable helium atoms and He, Ne, A and K have been measured and in the asymmetrical cases are observed to rise linearly with increasing atomic number of the target atom. Some collisions involving helium resonance radiation have also been studied. In particular, the photo-electric yield from the gold surface has been determined together with the attenuation of the photon flux in passage through certain noble gases.

Electron-capture cross sections for low-energy highly charged neon and argon ions from molecular and atomic hydrogen

1985 ◽  
Vol 31 (1) ◽  
pp. 72-83 ◽  
Author(s):  
Cüneyt Can ◽  
Tom J. Gray ◽  
S. L. Varghese ◽  
J. M. Hall ◽  
L. N. Tunnell
Keyword(s):  
Electron Capture ◽  
Cross Sections ◽  
Atomic Hydrogen ◽  
Low Energy ◽  
Capture Cross ◽  
Argon Ions ◽  
Capture Cross Sections

Calculation of Photo-Ionisation Cross Sections and Radiative Recombination Rate Coefficients for CO and CO+Molecules

2014 ◽  
Vol 16 (11) ◽  
pp. 1013-1019
Author(s):  
Raja Dhouioui ◽  
Philippe Teulet ◽  
Yann Cressault ◽  
Hassen Ghalila ◽  
Riadh Riahi ◽  
...  
Keyword(s):  
Cross Sections ◽  
Recombination Rate ◽  
Radiative Recombination ◽  
Rate Coefficients ◽  
Radiative Recombination Rate

Driftgeschwindigkeiten, Diffusionskoeffizienten und Temperaturen von Photoionen in Argon, Stickstoff und Sauerstoff / Drift velocities, diffusion coefficients and temperatures of photo-ions in argon, nitrogen and oxygen

1972 ◽  
Vol 27 (7) ◽  
pp. 1127-1135
Author(s):  
Peter Warneck
Keyword(s):  
Cross Sections ◽  
Ground State ◽  
Diffusion Coefficients ◽  
Drift Chamber ◽  
Drift Region ◽  
Gas Temperature ◽  
Oxygen Ions ◽  
Argon Ions ◽  
High Fields ◽  
And Diffusion

Abstract Groups of ions were produced by photoionisation of argon, nitrogen and oxygen in a drift chamber, using as the light source a repetitive spark discharge in combination with a uv monochromator. After their traversal of the drift region, the ions were detected in a mass spectrometer. An analysis of the temporal arrival profiles provided ionic drift velocities and diffusion coefficients as a function of gas pressure and electric field. For ions in their electronic and vibrational ground states, the measured drift velocities are in accord with previous data in the literature. At some wave lengths excited ions are produced in addition to ground state ions. Their drift velocities are larger on account of smaller charge transfer cross sections. Drift velocities and diffusion coefficients pro-vide ion temperatures as a function of the reduced field strength. Ion temperatures for argon ions correspond to the gas temperature. For nitrogen and oxygen ions the temperatures increase linearly with E/P and extrapolate at high fields to those given by Wannier's theory

Non L.T.E. Properties of Quasistationary Oxygen Plasmas

1976 ◽  
Vol 31 (3-4) ◽  
pp. 362-368 ◽  
Author(s):  
M. Cacciatore ◽  
M. Capitelli
Keyword(s):  
Excited States ◽  
Cross Sections ◽  
Ground State ◽  
Radiative Recombination ◽  
Local Thermodynamic Equilibrium ◽  
Collisional Radiative Model ◽  
Radiative Model ◽  
Ionization Coefficients ◽  
Selection Of ◽  
The Continuum

The non L.T.E. (local thermodynamic equilibrium) properties of optically thin and thick quasistationary oxygen plasmas have been calculated for the temperature range k T = 0.5 - 1.5 eV and for the electron density interval 108 - 1016 cm-3 , by using the collisional-radiative model of Bates, Kingston and McWhirther. The results include1 the coefficients r0(i) and r1(i), which represent the contribution to the population density of the ith quantum level from the continuum and from the ground state, respectively2 the values of α and S, which are the collisional-radiative recombination and ionization coefficients, respectively. The accuracy of the present results is discussed in connection with the adopted plasma model and with the selection of the collisional cross sections for forbidden and allowed transitions. A discussion is also presented of the influence of the two low lying excited states of oxygen atoms (i.e. the states 2p41D, 2p41S) on the non L.T.E. properties of these plasmas. A satisfactory agreement is found with the calculations of Julienne et al. and with the experimental results of Jones.

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