Analysis of Plasma Distribution near the Extraction Region in Negative Ion Sources with Surface and Volume Produced Negative Ions

AbstractUsing a newly developed ion beam apparatus, PANDA (Positive And Negative ions Deposition Apparatus), carbon nitride films were prepared by simultaneous deposition of mass-analyzed low energy positive and negative ions such as C2-, N+, under ultra high vacuum conditions, in the order of 10−6 Pa on silicon wafer. The ion energy was varied from 50 to 400 eV. The film properties as a function of their beam energy were evaluated by Rutherford Backscattering Spectrometry (RBS), Fourier Transform Infrared spectroscopy (FTIR) and Raman scattering. From the results, it is suggested that the C-N triple bond contents in films depends on nitrogen ion energy.

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Note on radiationless transitions involving three-body collisions

Mathematical Proceedings of the Cambridge Philosophical Society ◽

10.1017/s0305004100019186 ◽

1936 ◽

Vol 32 (3) ◽

pp. 482-485 ◽

Cited By ~ 2

Author(s):

R. A. Smith

Keyword(s):

Continuous Spectrum ◽

Negative Ions ◽

Bound State ◽

Excess Energy ◽

Negative Ion ◽

Positive Ions ◽

Continuous State ◽

Direct Formation ◽

Three Body ◽

Positive Ion

When an electron makes a transition from a continuous state to a bound state, for example in the case of neutralization of a positive ion or formation of a negative ion, its excess energy must be disposed of in some way. It is usually given off as radiation. In the case of neutralization of positive ions the radiation forms the well-known continuous spectrum. No such spectrum due to the direct formation of negative ions has, however, been observed. This process has been fully discussed in a recent paper by Massey and Smith. It is shown that in this case the spectrum would be difficult to observe.

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Chaos in positive ion–negative ion magnetized plasmas

Journal of Plasma Physics ◽

10.1017/s0022377820001348 ◽

2020 ◽

Vol 86 (6) ◽

Author(s):

Samiran Ghosh ◽

Biplab Maity ◽

Swarup Poria

Keyword(s):

Nonlinear Wave ◽

Low Frequency ◽

Negative Ions ◽

Dynamical Behaviour ◽

Negative Ion ◽

Sound Waves ◽

Weakly Nonlinear ◽

Positive Ions ◽

Experimental Parameters ◽

Map Analysis

The dynamical behaviour of weakly nonlinear, low-frequency sound waves are investigated in a plasma composed of only positive and negative ions incorporating the effects of a weak external uniform magnetic field. In the plasma model the mass (temperature) of the positive ions is smaller (larger) than that of the negative ions. The dynamics of the nonlinear wave is shown to be governed by a novel nonlinear equation. The stationary plane wave (analytical and numerical) nonlinear analysis on the basis of experimental parameters reveals that the nonlinear wave does have quasi-periodic and chaotic solutions. The Poincarè return map analysis confirms these observed complex structures.

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Design considerations for high-intensity negative ion sources

Nuclear Instruments and Methods ◽

10.1016/0029-554x(65)90528-8 ◽

1965 ◽

Vol 32 (2) ◽

pp. 309-316 ◽

Cited By ~ 40

Author(s):

K.W. Ehlers

Keyword(s):

High Intensity ◽

Ion Sources ◽

Negative Ion ◽

Design Considerations

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