A method for simultaneous determination of the diffusion coefficient of particles in gas media and their reflection coefficient at the wall

Rusinov, I.; Paeva, G W; Blagoev, A.

doi:10.1088/0022-3727/30/13/008

Cited by 16 publications

(3 citation statements)

References 12 publications

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“…This phenomenon was discussed by several authors: Sadeghi and Pebay-Peirola (1974), Chantry (1987), etc. In principle it is possible to measure the diffusion coefficient of some species together with their reflection coefficient from the wall (Rusinov et al 1997). However, the different volume losses of excited atoms in our experimental conditions are considerable.…”

Section: Resultsmentioning

confidence: 99%

Diffusion and depopulation of the metastable Cd³P_0,2states in collisions with Ne and Cd atoms

Ogoyski¹,

Rusinov²,

Blagoev³

1999

J. Phys. B: At. Mol. Opt. Phys.

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The temperature dependences of the diffusion coefficients of metastable Cd(5 3 P 2,0 ) atoms in Ne are determined using the afterglow technique. In the temperature range 515-568 K they are D( 3 P 0 ) = (2.2±0.7)×(T /780) 1.75 cm 2 s −1 and D( 3 P 2 ) = (2.1±0.6)×(T /780) 1.75 cm 2 s −1 at 1 atm Ne pressure. The coefficients of the excitation transfer in the fine structure of a Cd triplet by collisions with a ground state's Ne and Cd atoms are also determined. In the same temperature range the averaged rate coefficients for the processes Cd(5 3 P 2 )+Ne( 1 S 0 ) → Cd(5 3 P 1,0 )+Ne( 1 S 0 ) and Cd(5 3 P 0 ) + Ne( 1 S 0 ) → Cd(5 3 P 1 ) + Ne( 1 S 0 ) are K 2 = (4.3 ± 1.3) × 10 14 cm 3 s −1 and K 01 = (3.2 ± 1.0) × 10 −14 cm 2 respectively, while the rate coefficients of the reactions

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Section: Resultsmentioning

confidence: 99%

Diffusion and depopulation of the metastable Cd³P_0,2states in collisions with Ne and Cd atoms

Ogoyski¹,

Rusinov²,

Blagoev³

1999

J. Phys. B: At. Mol. Opt. Phys.

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“…whereas at the capillary wall, we consider partial reflectivity of the metastable states through a boundary condition of the third type [13]:…”

Section: Transport Of Excited States 1) Collisional Diffusionmentioning

confidence: 99%

Influence of non-local radiation transport on the gain of a He-Ne ring laser

Macé

Virdis²,

Maynard

2013

2013 19th IEEE Pulsed Power Conference (PPC)

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A global modeling of a He-Ne ring laser gyro (RLG) has been developed. The physical model of the positive column of the DC discharge includes a fluid description of the plasma, a collisional radiative model (1D-CRM) for the dynamics of excited atomic states and a Maxwell-Bloch calculation of laser amplification. In the present paper we use this global modeling to analyze the influence of the radial transport of excited states, through diffusion and radiative transfer, on the radial profile of the laser gain. Concerning radiative transfer, a full matrix transfer has been determined using a Monte-Carlo calculation and introduced in the 1D-CRM. Using this code, we have analyzed the influence of the boundary condition for the diffusion equation at the capillary walls on the metastable atom densities and on the laser gain.

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“…To account for the reflection of gold atoms from the walls we use the boundary condition given in Ref. 54.…”

Section: Negative Glowmentioning

confidence: 99%

Au-II 282 nm segmented hollow-cathode laser-parametric studies and modeling

Bánó

Szalai

Horváth

et al. 2002

Journal of Applied Physics

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Laser operation on the Au-II 282.3 nm ultraviolet transition is obtained using a high-voltage segmented hollow-cathode discharge tube. The metal vapor is produced by means of cathode sputtering. A small amount of argon is added to the helium buffer gas in order to achieve higher sputtering yield. Measurements of the laser power and small signal gain indicate that the optimal partial concentration of argon is in the range of 0.25%-0.75%. Quasi-continuous wave output power of 100 mW is obtained from a 34-cm-long active region while the highest small-signal gain is 52% m Ϫ1. To explain the basic features of the laser operation we present a model of the segmented hollow-cathode discharge. All the discharge characteristics are calculated in a self-consistent way except the temperature of slow electrons. The trajectories of fast electrons emitted from the cathode are followed by Monte Carlo simulation. Rate equations of ion, metastable and metal atom densities are solved in the negative glow, while another Monte Carlo code is applied for the fast heavy particles in the cathode sheath. The spatial distribution of the gas temperature and the thermalization of sputtered metal atoms are calculated as well. The laser characteristics predicted by the model are in reasonable agreement with the experimental results.

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A method for simultaneous determination of the diffusion coefficient of particles in gas media and their reflection coefficient at the wall

Cited by 16 publications

References 12 publications

Diffusion and depopulation of the metastable Cd³P_0,2states in collisions with Ne and Cd atoms

Diffusion and depopulation of the metastable Cd³P_0,2states in collisions with Ne and Cd atoms

Influence of non-local radiation transport on the gain of a He-Ne ring laser

Au-II 282 nm segmented hollow-cathode laser-parametric studies and modeling

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A method for simultaneous determination of the diffusion coefficient of particles in gas media and their reflection coefficient at the wall

Cited by 16 publications

References 12 publications

Diffusion and depopulation of the metastable Cd3P0,2states in collisions with Ne and Cd atoms

Diffusion and depopulation of the metastable Cd3P0,2states in collisions with Ne and Cd atoms

Influence of non-local radiation transport on the gain of a He-Ne ring laser

Au-II 282 nm segmented hollow-cathode laser-parametric studies and modeling

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Diffusion and depopulation of the metastable Cd³P_0,2states in collisions with Ne and Cd atoms

Diffusion and depopulation of the metastable Cd³P_0,2states in collisions with Ne and Cd atoms